two numbers a and b are such that the sum of 7 % of a and 4 % of b is two - third of the sum of 6 % of a and 8 % of b . find the ratio of a : b .
"explanation : 7 % of a + 4 % of b = 2 / 3 ( 6 % of a + 8 % of b ) 7 a / 100 + 4 b / 100 = 2 / 3 ( 6 a / 100 + 8 b / 100 ) ⇒ 7 a + 4 b = 2 / 3 ( 6 a + 8 b ) ⇒ 21 a + 12 b = 12 a + 16 b ⇒ 9 a = 4 b ⇒ ab = 4 / 9 ⇒ a : b = 4 : 9 answer : option c"
divide(subtract(divide(multiply(divide(8, const_100), 4), const_3), divide(4, const_100)), subtract(divide(7, const_100), divide(multiply(divide(6, const_100), 4), const_3)))