in what ratio must rice of rs . 54 per kg be mixed with rice of rs . 35 per kg so that cost of mixture is rs . 42 per kg ?
( 42 - 35 ) / ( 54 - 42 ) = 7 / 12 = 7 : 12 answer : b
divide(divide(subtract(42, 35), subtract(54, 35)), subtract(const_1, divide(subtract(42, 35), subtract(54, 35))))