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

Problem: the least number which should be added to 1789 so that the sum is exactly divisible by 5 , 6 , 4 and 3 is ?
11

Problem: how much interest will $ 10,000 earn in 9 months at an annual rate of 4 % ?
$ 300

Problem: a pupil ' s marks were wrongly entered as 85 instead of 45 . due to that the average marks for the class got increased by half . the number of pupils in the class is :

80