The task is to generate the correct answer for a given math problem.
--------
Question: Problem: a rectangle having length 89 cm and width 34 cm . if the length of the rectangle is increased by eighty percent then how much percent the breadth should be decreased so as to maintain the same area .

Answer: 47.33 %


Question: Problem: if x , y , and z are positive integers , and 3 x = 5 y = 6 z , then the least possible value of x + y + z is

Answer: 21


Question: Problem: john and david can finish a job together in 4 hours . if john can do the job by himself in 5 hours , what percent of the job does david do ?

Answer:
20 %