if a : b : c = 3 : 4 : 7 , then the ratio ( a + b + c ) : c is equal to
solution : ( a + b + c ) = 3 + 4 + 7 = 14 and c = 7 then , ( a + b + c ) : c = 2 : 1 . answer : option a
divide(add(add(3, 4), 7), 7)