sandy is younger than molly by 10 years . if their ages are in the respective ratio of 7 : 9 , how old is molly ?
"s = m - 10 s / m = 7 / 9 9 s = 7 m 9 ( m - 10 ) = 7 m m = 45 the answer is c ."
multiply(divide(7, subtract(9, 7)), 10)