find the numbers which are in the ratio 5 : 2 : 4 such that the sum of the first and the second added to the difference of the third and the second is 18 ?
"let the numbers be a , b and c . a : b : c = 5 : 2 : 4 given , ( a + b ) + ( c - b ) = 21 = > a + c = 21 = > 5 x + 4 x = 18 = > x = 2 a , b , c are 5 x , 2 x , 4 x a , b , c are 10 , 4 , 8 . answer : c"
divide(multiply(4, 5), 5)