sachin is younger than rahul by 18 years . if the ratio of their ages is 7 : 9 , find the age of sachin
"explanation : if rahul age is x , then sachin age is x - 18 , so , 9 x - 162 = 7 x 2 x = 162 x = 81 so sachin age is 81 - 18 = 63 answer : b ) 63"
multiply(divide(18, subtract(9, 7)), 7)