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

Problem: 13 buckets of water fill a tank when the capacity of each bucket is 42 litres . how many buckets will be needed to fill the same tank , if the capacity of each bucket is 6 litres ?
91

Problem: the average of 10 numbers is 0 . in those 10 , at the least , how many may be greater than or equal to zero ?
1

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 .

47.33 %