in what ratio must rice of rs . 16 per kg be mixed with rice of rs . 10 per kg so that cost of mixture is rs . 12 per kg ?
"( 12 - 10 ) / ( 16 - 12 ) = 2 / 4 = 1 : 2 answer : e"
divide(divide(subtract(12, 10), subtract(16, 10)), subtract(const_1, divide(subtract(12, 10), subtract(16, 10))))