the ages of ashley and mary are in the ratio 4 : 7 . the sum of their ages is 22 . find the age of mary .
"a : m = 4 : 7 let the ages of a & m be x & 22 - x x / 22 - x = 4 / 7 x = 8 a = 8 yrs m = 14 yrs answer : d"
multiply(divide(22, add(4, 7)), 4)