in what ratio p : q should the mixture p of milk and water in the ratio of 6 : 1 be mixed with another mixture q of milk and water in the ratio 3 : 4 so that the resultant mixture contains equal quantities of milk and water ?
"( 6 / 7 ) * p + ( 3 / 7 ) * q = ( 1 / 7 ) * p + ( 4 / 7 ) * q 5 p = q p / q = 1 / 5 the answer is c ."
add(subtract(add(1, 4), add(6, 3)), const_1)