find the numbers which are in the ratio 3 : 2 : 2 such that the sum of the first and the second added to the difference of the third and the second is 20 ?
"let the numbers be a , b and c . a : b : c = 3 : 2 : 2 given , ( a + b ) + ( c - b ) = 20 = > a + c = 20 = > 3 x + 2 x = 20 = > x = 4 a , b , c are 3 x , 2 x , 2 x a , b , c are 12 , 8 , 8 . answer : a"
divide(multiply(const_4.0, 3), 3)