Mathematics Competitions

Description: Mathematics Competitions Quiz
Number of Questions: 15
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Tags: mathematics competitions problem solving mathematical reasoning
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What is the value of x in the equation x^2 - 5x + 6 = 0?

  1. 2, 3

  2. 1, 6

  3. 3, 2

  4. 6, 1


Correct Option: A
Explanation:

Using the quadratic formula, x = (-b ± √(b² - 4ac)) / 2a, where a = 1, b = -5, and c = 6, we get x = (5 ± √(25 - 24)) / 2 = (5 ± 1) / 2. Therefore, x = 2 or x = 3.

A train leaves New York City at 10:00 AM and travels at a speed of 70 mph. Another train leaves Chicago at 11:00 AM and travels towards New York City at a speed of 80 mph. If the distance between New York City and Chicago is 900 miles, at what time will the two trains meet?

  1. 1:00 PM

  2. 1:30 PM

  3. 2:00 PM

  4. 2:30 PM


Correct Option: C
Explanation:

The first train travels for 1 hour before the second train leaves. In that time, it travels 70 mph * 1 hour = 70 miles. Therefore, the distance between the two trains at 11:00 AM is 900 miles - 70 miles = 830 miles. The two trains are traveling towards each other at a combined speed of 70 mph + 80 mph = 150 mph. Therefore, they will meet in 830 miles / 150 mph = 5.53 hours after 11:00 AM, which is 2:00 PM.

A company has 100 employees, of which 60% are women and 40% are men. If 20% of the women and 30% of the men are promoted, how many employees in total are promoted?

  1. 22

  2. 24

  3. 26

  4. 28


Correct Option: C
Explanation:

There are 60 women and 40 men in the company. 20% of the women are promoted, which is 0.2 * 60 = 12 women. 30% of the men are promoted, which is 0.3 * 40 = 12 men. Therefore, the total number of employees promoted is 12 + 12 = 24.

A rectangular garden has a length of (x + 2) meters and a width of (x - 3) meters. If the area of the garden is 24 square meters, what is the value of x?

  1. 3

  2. 4

  3. 5

  4. 6


Correct Option: C
Explanation:

The area of a rectangle is length * width. Therefore, (x + 2)(x - 3) = 24. Expanding the brackets, we get x^2 - x - 6 = 24. Rearranging, we get x^2 - x - 30 = 0. Factoring, we get (x - 6)(x + 5) = 0. Therefore, x = 6 or x = -5. Since the length of the garden cannot be negative, x = 6.

In a certain code, 'APPLE' is written as '31125'. What is the code for 'ORANGE'?

  1. 1518975

  2. 0151897

  3. 1051897

  4. 0105189


Correct Option: D
Explanation:

In the code, each letter is represented by its position in the alphabet. For example, 'A' is represented by '1', 'P' is represented by '16', and so on. Therefore, 'ORANGE' is coded as '0151897'.

A shop sells a shirt for $20. If the shop offers a 20% discount on the shirt, what is the sale price of the shirt?

  1. $16

  2. $17

  3. $18

  4. $19


Correct Option: A
Explanation:

The discount is 20% of $20, which is 0.2 * $20 = $4. Therefore, the sale price of the shirt is $20 - $4 = $16.

A train travels from City A to City B at a speed of 60 mph. On the return journey, the train travels at a speed of 75 mph. If the total time taken for the round trip is 5 hours, what is the distance between City A and City B?

  1. 187.5 miles

  2. 200 miles

  3. 212.5 miles

  4. 225 miles


Correct Option: B
Explanation:

Let the distance between City A and City B be x miles. The time taken for the journey from City A to City B is x / 60 hours, and the time taken for the journey from City B to City A is x / 75 hours. The total time taken for the round trip is the sum of these two times, which is (x / 60) + (x / 75) = 5 hours. Solving for x, we get x = 200 miles.

A company has 100 employees, of which 60% are women and 40% are men. If 20% of the women and 30% of the men are promoted, how many men are promoted?

  1. 12

  2. 14

  3. 16

  4. 18


Correct Option: A
Explanation:

There are 60 women and 40 men in the company. 20% of the women are promoted, which is 0.2 * 60 = 12 women. 30% of the men are promoted, which is 0.3 * 40 = 12 men. Therefore, the total number of men promoted is 12.

A rectangular room has a length of 12 feet and a width of 8 feet. What is the area of the room in square feet?

  1. 96

  2. 104

  3. 112

  4. 120


Correct Option: A
Explanation:

The area of a rectangle is length * width. Therefore, the area of the room is 12 feet * 8 feet = 96 square feet.

A train leaves New York City at 10:00 AM and travels at a speed of 70 mph. Another train leaves Chicago at 11:00 AM and travels towards New York City at a speed of 80 mph. If the distance between New York City and Chicago is 900 miles, at what time will the two trains meet?

  1. 1:00 PM

  2. 1:30 PM

  3. 2:00 PM

  4. 2:30 PM


Correct Option: C
Explanation:

The first train travels for 1 hour before the second train leaves. In that time, it travels 70 mph * 1 hour = 70 miles. Therefore, the distance between the two trains at 11:00 AM is 900 miles - 70 miles = 830 miles. The two trains are traveling towards each other at a combined speed of 70 mph + 80 mph = 150 mph. Therefore, they will meet in 830 miles / 150 mph = 5.53 hours after 11:00 AM, which is 2:00 PM.

A company has 100 employees, of which 60% are women and 40% are men. If 20% of the women and 30% of the men are promoted, how many employees in total are promoted?

  1. 22

  2. 24

  3. 26

  4. 28


Correct Option: C
Explanation:

There are 60 women and 40 men in the company. 20% of the women are promoted, which is 0.2 * 60 = 12 women. 30% of the men are promoted, which is 0.3 * 40 = 12 men. Therefore, the total number of employees promoted is 12 + 12 = 24.

A rectangular garden has a length of (x + 2) meters and a width of (x - 3) meters. If the area of the garden is 24 square meters, what is the value of x?

  1. 3

  2. 4

  3. 5

  4. 6


Correct Option: C
Explanation:

The area of a rectangle is length * width. Therefore, (x + 2)(x - 3) = 24. Expanding the brackets, we get x^2 - x - 6 = 24. Rearranging, we get x^2 - x - 30 = 0. Factoring, we get (x - 6)(x + 5) = 0. Therefore, x = 6 or x = -5. Since the length of the garden cannot be negative, x = 6.

In a certain code, 'APPLE' is written as '31125'. What is the code for 'ORANGE'?

  1. 1518975

  2. 0151897

  3. 1051897

  4. 0105189


Correct Option: D
Explanation:

In the code, each letter is represented by its position in the alphabet. For example, 'A' is represented by '1', 'P' is represented by '16', and so on. Therefore, 'ORANGE' is coded as '0151897'.

A shop sells a shirt for $20. If the shop offers a 20% discount on the shirt, what is the sale price of the shirt?

  1. $16

  2. $17

  3. $18

  4. $19


Correct Option: A
Explanation:

The discount is 20% of $20, which is 0.2 * $20 = $4. Therefore, the sale price of the shirt is $20 - $4 = $16.

A train travels from City A to City B at a speed of 60 mph. On the return journey, the train travels at a speed of 75 mph. If the total time taken for the round trip is 5 hours, what is the distance between City A and City B?

  1. 187.5 miles

  2. 200 miles

  3. 212.5 miles

  4. 225 miles


Correct Option: B
Explanation:

Let the distance between City A and City B be x miles. The time taken for the journey from City A to City B is x / 60 hours, and the time taken for the journey from City B to City A is x / 75 hours. The total time taken for the round trip is the sum of these two times, which is (x / 60) + (x / 75) = 5 hours. Solving for x, we get x = 200 miles.

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