the ratio between b and y is 7 / 9 ; b and y are increased by 4 , what is the ratio between the new values of b and y ?
ratio = 7 k / 9 k = 7 / 9 , 14 / 18 , etc . b and y are increased by 4 - - > ( 7 k + 4 ) / ( 9 k + 4 ) new ratio can be 11 / 13 , 18 / 22 , etc . answer : e
divide(add(7, 4), add(9, 4))