FUN WITH MATHEMATICS
BRAIN-TEASERS
PUZZLES & RIDDLES
Two boatmen start simultaneously from the opposite shores of a river and they cross each other after 45 minutes of their starting from the respective shores. They rowed till they reached the opposite shore and returned immediately after reaching the shores. When will they cross each other again?
Answer: _______
90 minutes
Three girls are climbing down a staircase. One girl climbs down two
steps at one go. The second girl three
steps at one go and the third climbs
316 down four steps. They started together from the beginning of the staircase leaving their foot marks. They all came down in complete steps and had their foot marks together at the bottom of the staircase. In how many steps would there be only one pair of foot mark?
Are there any steps on which there would be no foot marks.
Answer: _______
Steps with one pair of foot marks – 2, 3, 9, 10
Steps with no foot marks – 1, 5, 7, 11
A group of soldiers was asked to fall in line making rows of three. It was found that there was one soldier extra. Then they were asked to stand in rows of five. It was found there were left 2 soldiers. They were asked to stand in rows of seven. Then there were three soldiers who could not be adjusted. At least how many soldiers were there in the group?
Answer: _______
52
Get 100 using four 9’s and some of the symbols like +, –, ×, ¸ etc.
Answer: _______
99 + 9/9
How many digits would be in the product 2 × 2 × 2 ..... × 2 (30 times)?
Answer: _______
10
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