ratio and proportion 215 : 474 : : 537 : ?
2 + 1 + 5 + 4 + 7 + 4 = 23 5 + 3 + 7 + x = 23 = > x = 8 combination that match 8 is 26 since 2 + 6 = 8 answer : a
add(add(const_4, const_2), add(const_10, const_10))