30 liters of a mixture is created by mixing liquid p and liquid q in the ratio 3 : 2 . how many liters of liquid q must be added to make the ratio 3 : 4 ?
"let x be the amount of liquid q to be added . ( 2 / 5 ) * 30 + x = ( 4 / 7 ) * ( 30 + x ) 420 + 35 x = 600 + 20 x 15 x = 180 x = 12 the answer is c ."
subtract(divide(multiply(divide(multiply(add(3, 4), divide(multiply(30, 3), add(3, 2))), 3), 4), add(3, 4)), divide(multiply(30, 2), add(3, 2)))