TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: a cycle is bought for rs . 900 and sold for rs . 1080 , find the gain percent ?

SOLUTION: 20 %

PROBLEM: Problem: a tyre has two punctures . the first puncture alone would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes . if air leaks out at a constant rate , how long does it take both the punctures together to make it flat ?

SOLUTION: 335 min

PROBLEM: Problem: if b is the center of the circle in the figure above and the area of the shaded region is 16 π , what is the length of arc adc ?

SOLUTION:
4 π', 'c ) 16', 'd ) 8 π', 'e ) 16'