0

math & puzzles Online Quiz - 72

Description: math & puzzles Online Quiz - 72
Number of Questions: 20
Created by:
Tags: math & puzzles
Attempted 0/20 Correct 0 Score 0

Can the mean (average) of 2 consecutive prime numbers be a prime number?

  1. True

  2. False


Correct Option: B

Banu recently went for shopping. She spent 85% of money she had on shopping. She is now left with Rs. 75. How much money did she have initially when she went for shopping...

  1. 500

  2. 475

  3. 1200

  4. 575


Correct Option: A

If an automobile depreciates by 25% of its original value each year, and a new car was bought for Rs.16,000, what will be its worth after 5 years?

  1. rs 12000

  2. rs 4000

  3. rs 3796.88

  4. rs 12550


Correct Option: C

What comes next in the series... Triangle, Quadrilateral, Petagon, Hexagon, __________

  1. Nanogon

  2. Heptagon

  3. Decagon

  4. None Of these


Correct Option: B

AI Explanation

To answer this question, we need to identify the pattern in the given series of shapes.

The given series starts with a Triangle, followed by a Quadrilateral, then a Pentagon, and finally a Hexagon.

We can observe that each shape in the series has an increasing number of sides. A triangle has 3 sides, a quadrilateral has 4 sides, a pentagon has 5 sides, and a hexagon has 6 sides.

Following this pattern, the next shape in the series should have 7 sides.

Therefore, the correct answer is:

B) Heptagon - This option is correct because a heptagon has 7 sides, which is the next shape in the series.

Aravind took a science test in school. If he got 23 out of 27 questions right what percentage did he score? Please round to the nearest percent.

  1. 82%

  2. 91%

  3. 85%

  4. 77%


Correct Option: C

Sharada reads an average of 20 books per year. She read 23, 17, 20, and 19 books in four different years. How many books did Sharada read in the 5th year to make it an average of 20 per year?

  1. 20

  2. 21

  3. 19

  4. 17


Correct Option: B

A natural number gets doubled when added to its reciprocal. Find that number!

  1. 2

  2. 1

  3. 0

  4. ½


Correct Option: B

Sandeep is 2 years older than Pradeep. The sum of their ages is 106. How old is Pradeep?

  1. 54

  2. 53

  3. 45

  4. 52


Correct Option: D

Sandeep is 2 years older than Pradeep. The sum of their ages is 106. How old is Pradeep?

  1. 54

  2. 53

  3. 45

  4. 52


Correct Option: D

Madhu is building a swimming pool. On the blueprint for the pool the scale is 3in. to every 5ft. If the length of the pool is 9in. on the blueprint how many feet is the actual length of the pool?

  1. 25 ft

  2. 15 ft

  3. 9 ft

  4. Insufficient Data


Correct Option: B

A poultry farm has only chickens and pigs. When the manager of the poultry counted the heads of the stock in the farm, the number totaled up to 200. However, when the number of legs was counted, the number totaled up to 540. How many chickens were there in the farm?

  1. 70

  2. 120

  3. 60

  4. 130

  5. 80


Correct Option: D

Three years back, a father was 24 years older than his son. At present the father is 5 times as old as the son. How old will the son be three years from now?

  1. 12 years

  2. 6 years

  3. 3 years

  4. 9 years

  5. 27 years


Correct Option: D

For what values of 'k' will the pair of equations 3x + 4y = 12 and kx + 12y = 30 not have a unique solution?

  1. 12

  2. 9

  3. 3

  4. 7.5

  5. 2.5


Correct Option: B

AI Explanation

To determine the values of 'k' for which the pair of equations 3x + 4y = 12 and kx + 12y = 30 does not have a unique solution, we need to consider the determinant of the coefficient matrix.

The coefficient matrix for the system of equations is: [ \begin{bmatrix} 3 & 4 \ k & 12 \ \end{bmatrix} ]

The determinant of this matrix is given by: [ \text{det} = (3)(12) - (k)(4) = 36 - 4k ]

For a system of equations to have a unique solution, the determinant must be non-zero. In other words, the determinant cannot equal zero.

So, to find the values of 'k' for which the system does not have a unique solution, we need to solve the equation 36 - 4k = 0.

Simplifying the equation, we have: 36 - 4k = 0 4k = 36 k = 9

Therefore, the values of 'k' for which the pair of equations does not have a unique solution are k = 9.

The basic one-way air fare for a child aged between 3 and 10 years costs half the regular fare for an adult plus a reservation charge that is the same on the child's ticket as on the adult's ticket. One reserved ticket for an adult costs $216 and the cost of a reserved ticket for an adult and a child (aged between 3 and 10) costs $327. What is the basic fare for the journey for an adult?

  1. $ 111

  2. $ 52.5

  3. $ 210

  4. $ 58.5

  5. $ 6


Correct Option: C

The average weight of a group of 30 friends increases by 1 kg when the weight of their football coach was added. If average weight of the group after including the weight of the football coach is 31kgs, what is the weight of their football coach in kgs?

  1. 31

  2. 61

  3. 60

  4. 62

  5. 91


Correct Option: B

If a circle is one, how many is an octagon?

  1. 2

  2. 4

  3. 6

  4. 8

  5. 12


Correct Option: D

Two men, starting at the same point, walk in opposite directions for 4 meters, turn left and walk another 3 meters. What is the distance between them?

  1. 2m

  2. 6m

  3. 10m

  4. 12.5m

  5. 14m


Correct Option: C

One of the following sentences given below means approximately the same as the proverb: "Don't count your chickens until they are hatched." Choose the one:

  1. Some eggs have double yolks, so you can't really count eggs and chickens.

  2. You can't walk around the henhouse to count the eggs because it will disturb the hens and they won't lay eggs.

  3. It is not really sensible to rely on something that has not yet happened and may not ever happen.

  4. Since eggs break so easily, you may not be accurate in your count of future chickens.


Correct Option: C

Pear is to apple as potato is to?

  1. banana

  2. raddish

  3. strawberry

  4. peach

  5. lettuce


Correct Option: B

What is ten thousand one hundred and twelve in figures?

  1. 10120

  2. 1112

  3. 10112

  4. 11012


Correct Option: C
- Hide questions