BRAIN-TEASERS 03

FUN WITH MATHEMATICS

BRAIN-TEASERS
PUZZLES & RIDDLES

Cement mortar was being prepared by mixing cement to sand in the ratio of 1:6 by volume. In a cement mortar of 42 units of volume, how much more cement needs to be added to enrich the mortar to the ratio 2:9?

Answer: ______

2 units

In a solution of common salt in water, the ratio of salt to water was 30:70 as per weight. If we evaporate 100 grams of water from one kilogram of this solution, what will be the ratio of the salt to water by weight?

Answer: _______

1:2

Half a swarm of bees went to collect honey from a mustard field. Three fourth of the rest went to a rose garden. The rest ten were still undecided. How many bees were there in all?

Answer: _______

80

Fifteen children are sitting in a circle. They are asked to pass a handkerchief to the child next to the child immediately after them. The game stops once the handkerchief returns to the child it started from. This can be written as follows : 1→3→5→7→9→11→13→15→2→4→6→8

→ 10→12 →14→1. Here, we see that every child gets the handkerchief.

(i) What would happen if the handkerchief were passed to the left leaving two children in between? Would every child get the handkerchief?

(ii) What if we leave three children in between? What do you see? In which cases every child gets the handkerchief and in which cases not?

Try the same game with 16, 17, 18, 19, 20 children. What do you see?

Answer: _______

(i) No, all children would not get it. 

(ii) All would get it.

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Play & Learn with your Friends Kutties! 👍

All the best! 

Thank You🙏🏻

 

BRAIN-TEASERS 02

FUN WITH MATHEMATICS
BRAIN-TEASERS
PUZZLES & RIDDLES

A boy was asked to find the LCM of 3, 5, 12 and another number. But while calculating, he wrote 21 instead of 12 and yet came with the correct answer. What could be the fourth number?

Answer: _______

28

There were five pieces of cloth of lengths 15 m, 21 m, 36 m, 42 m, 48 m. But all of them could be measured in whole units of a measuring rod. What could be the largest length of the rod?

Answer: _______

3M

Which two digit numbers when added to 27 get reversed?

Answer: _______

The man takes an empty vessel other than these.

With the help of 3 litres can he takes out 9 litres of milk from the 10 litres can and pours it in the extra can. So, 1 litre milk remains in the 10 litres can. With the help of 7 litres can he takes out 7 litres of milk from the extra can and pours it in the 10 litres can. The 10 litres can now has 1 + 7 = 8 litres of milk.

With the help of 3 litres can he takes out 3 litres milk from the 10 litres can. 

The 10 litres can now has 8 – 3 = 5 litres of milk, which he gives to the customer.

 

There are three cans. One of them holds exactly 10 litres of milk and is full. The other two cans can hold 7 litres and 3 litres respectively. There is no graduation mark on the cans. A customer asks for 5 litres of milk. How would you give him the amount he ask? He would not be satisfied by eye estimates.

Answer: _______

14, 25, 36, 47, 58, 69

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Play & Learn with your Friends Kutties! 👍

All the best! 

Thank You🙏🏻