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

Example Input: Problem: an aeroplane covers a certain distance of 670 kmph in 6 hours . to cover the same distance in 6 1 / 4 hours , it must travel at a speed of
Example Output: 643

Example Input: Problem: find large number from below question the difference of two numbers is 1360 . on dividing the larger number by the smaller , we get 6 as quotient and the 15 as remainder
Example Output: 162

Example Input: Problem: 864.942 - ? + 45.76 = 547.905
Example Output:
d ) 362.797