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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