Question

Which number should be added to 7 so the number thus formed will be less than 15, and will also be a multiple of 3? Find all such numbers which can be added to 7.

Answer 1

The number formed will be a multiple of 3, and the formed number should be less than 15.

So, multiples of 3 less than 15 are 3, 6, 9, and 12.

Out of the possible multiples of 3, only 9 and 12 can be obtained by adding a number to 7, as 3 and 6 are less than 7.

Therefore 9 - 7 = 2 and 12 - 7 = 5.
So, the numbers which should be added to 7 are 2 and 5.