Exercise 1

Breeding of a certain species of insects is incredible everyday the total number of such insects in a closed glass jar is double the number on the previous day. There was just one insect in the jar on 1/2/2007, and the jar was full to the brim with these insects on 28/2/2007. On which date of February was the jar quarter-full?

The flowers in a basket double every minute and the basket gets full in one hour. In how much time, the basket wasfull?

A man's investment doubles in every 5 years. If he invested Rs. 5000 in each of the years 1990, 1995, 2000 and 2005, then what was the total amount received by him in 2010?

After measuring 120 metres of a rope, it was discovered that the measuring metre rod was 3 cm longer. The true length of the rope measured is

On Children’s Day, sweets were to be equally distributed among 175 children in a school. Actually on the Children’s Day, 35 children were absent and therefore each child got 4 sweets extra. Total how many sweets were available for distribution ?

A boy multiplied 423 by a number and obtained 65589 as his answer. If both the fives in the answer are wrong and all other figures are correct, the correct answer is:

A candidate was asked to findof a positive number. He found of the same by mistake. If his answer was 770 less than the correct one, then the original given number was

A student was asked to divide a number by Instead; he actually multiplied it by and hence got 225 more than the expected answer. What was the expected answer?

One junior student is asked to divide half a number by 6 and the other half by 4 and then add the quantities. Instead of doing so, the student divides the given number by 5. If the answer is 4 short of the correct answer, then the number is

If 3is subtracted from and the difference is multiplied by 450, what is the final answer?