Problem: what least number should be subtracted from 13601 such that the remainder is divisible by 87 ?
Rationale: "13601 ÷ 87 = 156 , remainder = 29 hence 29 is the least number which can be subtracted from 13601 such that the remainder is divisible by 87 answer is b"
annotated_formula: reminder(13601, 87)