instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: a certain fraction is equivalent to 3 / 5 . if the numerator of the fraction is increased by 4 and the denominator is doubled , the new fraction is equivalent to 1 / 3 . what is the sum of the numerator and denominator of the original fraction ?
answer:
56


question:
Problem: a swimmer can swim in still water at 4 km / h . if the speed of the water current is 2 km / h , how many hours will the swimmer take to swim against the current for 5 km ?
answer:
2.5


question:
Problem: find the perimeter and area of the rectangle of length 11 cm and breadth 9 cm .
answer:

99 cm 2