what must be added to each term of the ratio 7 : 11 , so as to make it equal to 3 : 4 ?
"solution : let x be added to each term . according to question , ( 7 + x ) / ( 11 + x ) = 3 / 4 ; or , 33 + 3 x = 28 + 4 x ; or , x = 5 . answer : option d"
divide(subtract(multiply(3, 11), multiply(4, 7)), subtract(4, 3))