Problem: a work as fast as b . if b can complete a work in 24 days independently , the number of days in which a and b can together finish the work in ?
Rationale: "ratio of rates of working of a and b = 2 : 1 ratio of times taken = 1 : 2 a ' s 1 day work = 1 / 12 b ' s 1 day work = 1 / 24 a + b 1 day work = 1 / 12 + 1 / 24 = 3 / 24 = 1 / 8 a and b can finish the work in 8 days answer is c"
annotated_formula: inverse(add(inverse(24), multiply(const_2, inverse(24))))