Problem: p has $ 21 more than what q and r together would have had if both b and c had 1 / 5 of what p has . how much does p have ?
Rationale: "p = ( 2 / 5 ) * p + 21 ( 3 / 5 ) * p = 21 p = 35 the answer is a ."
annotated_formula: divide(21, subtract(1, multiply(divide(1, 5), const_2)))