instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: a question paper has 2 parts , a & b , each containing 8 questions . if a student has to choose 8 from part a & 4 from part b , in how many ways can he choose the questions ?
answer:
70

question:
Problem: by selling an article for $ 195 , a person gains $ 45 . what is the gain % ?
answer:
30 %

question:
Problem: the ratio between the length and the breadth of a rectangular plot is 7 : 5 . if the perimeter of the plot is 288 metres , what is its area ?
answer:
5040 sq . metres', 'e ) none of these'