Problem: the ratio of two quantities is 10 : 7 . if each of the quantities is increased by 2 , their ratio changes to 15 : 11 then the greatest number is ?
Rationale: "let the numbers be 10 x and 7 x then 10 x + 2 / 7 x + 2 = 15 / 11 110 x + 22 = 105 x + 30 5 x = 8 x = 1.6 greatest number = 10 * 1.6 = 16 answer is d"
annotated_formula: divide(add(10, 2), add(7, 2))