BRAIN-TEASERS 10

FUN WITH MATHEMATICS

BRAIN-TEASERS
PUZZLES & RIDDLES

 Go round a square

Counting every corner

Thrice and no more!

Add the count to me

To get exactly thirty four!

WHO AM I ?

Answer: _______

22

For each day of the week 

Make an upcount from me 

If you make no mistake 

You will get twenty three!

WHO AM I ?

Answer: _______

16

I am a special number

Take away from me a six!

whole cricket team 

You will still be able to fix!

WHO AM I?

Answer: _______

17

Tell me who I am

I shall give a pretty clue!

You will get me back

If you take me out of twenty two!

WHO AM I?

Answer: _______

11

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BRAIN-TEASERS 09

FUN WITH MATHEMATICS

BRAIN-TEASERS
PUZZLES & RIDDLES

 Rahul wanted to find the height of a tree in his garden. He checked the ratio of his height to his shadow’s length. It was 4:1. He then measured the shadow of the tree. It was 15 feet. So what was the height of the tree?

Answer: _______

60 FEET

A woodcutter took 12 minutes to make 3 pieces of a block of wood. How much time would be needed to make 5 such pieces?

Answer: _______

24 MINUTES

A cloth shrinks 0.5% when washed. What fraction is this?

Answer: _______

1/200

Smita’s mother is 34 years old. Two years from now mother’s age will be 4 times Smita’s present age. What is Smita’s present age?

Answer: _______

7 YEARS

Maya, Madhura and Mohsina are friends studying in the same class. In a class test in geography, Maya got 16 out of 25. Madhura got 20. Their average score was 19. How much did Mohsina score?

Answer: _______

21

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BRAIN-TEASERS 08

FUN WITH MATHEMATICS

BRAIN-TEASERS
PUZZLES & RIDDLES

 Solve the number riddles:

(i) Tell me who I am! Who I am!

Take away from me the number eight,

Divide further by a dozen to come up with A full team for a game of cricket!

(ii) Add four to six times a number,

To get exactly sixty four!

Perfect credit is yours to ask for

If you instantly tell the score!

Answer: _______

140

(II)10

Solve the teasers:

(i) There was in the forest an old Peepal tree

The grand tree had branches ten and three

On each branch there lived birds fourteen

Sparrows brown, crows black and parrots green!

Twice as many as the parrots were the crows

And twice as many as the crows were the sparrows!

We wonder how many birds of each kind

Aren’t you going to help us find?

 

Answer: _______

(i)  Sparrows: 104, crows: 52, Parrots: 26

I have some five-rupee coins and some two-rupee coins. The number of two-rupee coins is twice the number of five-rupee coins. The total money I have is 108 rupees. So how many five-rupee coins do I have? And how many two-rupee coins?

Answer: _______

(II)Number of  5 coins = 12, Number of  2 coins = 24

I have 2 vats each containing 2 mats. 2 cats sat on each of the mats. Each cat wore 2 funny old hats. On each hat lay 2 thin rats. On each rat perched 2 black bats. How many things are in my vats?

Answer: _______

124

Twenty-seven small cubes are glued together to make a big cube. The exterior of the big cube is painted yellow in colour. How many among each of the 27 small cubes would have been painted yellow on

(i) only one of its faces?

(ii) two of its faces?

(iii) three of its faces?

Answer: _______

(I) 6

(II) 10

(III) 8

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BRAIN-TEASERS 07

FUN WITH MATHEMATICS

BRAIN-TEASERS
PUZZLES & RIDDLES

 Three friends plucked some mangoes from a mango grove and collected them together in a pile and took nap after that. After some time, one of the friends woke up and divided the mangoes into three equal numbers. There was one mango extra. He gave it to a monkey nearby, took one part for himself and slept again. Next the second friend got up unaware of what has happened, divided the rest of the mangoes into three equal shares. There was an extra mango. He gave it to the monkey, took one share for himself and slept again. Next the third friend got up not knowing what happened and divided the mangoes into three equal shares. There was an extra mango. He gave it to the monkey, took one share for himself and went to sleep again. After some time, all of them got up together to find 30 mangoes. How many mangoes did the friends pluck initially?

Answer: _______

106 MANGOES

The peculiar number

There is a number which is very peculiar. This number is three times the sum of its digits. Can you find the number?

Answer: _______

27

Ten saplings are to be planted in straight lines in such way that each line has exactly four of them.

Answer: _______

One arrangement could be

What will be the next number in the sequence?

(a) 1, 5, 9, 13, 17, 21, ...

(b) 2, 7, 12, 17, 22, ...

(c) 2, 6, 12, 20, 30, ...

(d) 1, 2, 3, 5, 8, 13, ...

(e) 1, 3, 6, 10, 15, ...

Answer: _______

(a) 25 (b) 27 (c) 42 (d) 21 (e) 21

Observe the pattern in the following statement:

31×39=13×93

The two numbers on each side are co-prime and are obtained by reversing the digits of respective numbers. Try to write some more pairs of such numbers.

Answer: _______

One such pair is  13 × 62 = 31 × 26.

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Thank You🙏🏻