FUN WITH MATHEMATICS
BRAIN-TEASERS
PUZZLES & RIDDLES
A man would be 5 minutes late to reach his destination if he rides his bike at 30 km. per hour. But he would be 10 minutes early if he rides at the speed of 40 km per hour. What is the distance of his destination from where he starts?
Answer: _______
30 KM
The ratio of speeds of two vehicles is 2:3. If the first vehicle covers 50 km in 3 hours, what distance would the second vehicle covers in 2 hours?
Answer: _______
50 KM
The ratio of income to expenditure of Mr. Natarajan is 7:5. If he saves ` 2000 a month, what could be his income?
Answer: _______
7000 PER MONTH
The ratio of the length to breadth of a lawn is 3:5. It costs ` 3200 to fence it at the rate of ` 2 a metre. What would be the cost of developing the lawn at the rate of `10 per square metre.
Answer: _______
15,00,000
If one counts one for the thumb, two for the index finger, three for the middle finger, four for the ring finger, five for the little finger and continues counting backwards, six for the ring finger, seven for the middle finger, eight for the index finger, 9 for the thumb, ten for the index finger, eleven for the middle finger, twelve for the ring finger, thirteen for the little finger, fourteen for the ring finger and so on. Which finger will be counted as one thousand?
Answer: _______
INDEX FINGER
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