The task is to generate the correct answer for a given math problem.

Example Input: Problem: how many multiples of 7 are there between 10 and 100 ( both are inclusive ) ?
Example Output: 13

Example Input: Problem: the sum of ages of 5 children born at the intervals of 3 years each is 55 years . what is the age of the youngest child ?
Example Output: 5 years

Example Input: Problem: a welder received an order to make a 1 million liter cube - shaped tank . if he has only 4 x 2 meter sheets of metal that can be cut , how many metal sheets will be required for this order y ? ( 1 cubic meter = 1000 liters )
Example Output:
7