in what ratio should a variety of rice costing rs . 7 per kg be mixed with another variety of rice costing rs . 14.50 per kg to obtain a mixture costing rs . 9.75 per kg ?
"let us say the ratio of the quantities of cheaper and dearer varieties = x : y by the rule of allegation , x / y = ( 14.50 - 9.75 ) / ( 9.75 - 7 ) = 31 / 15 answer : b"
divide(divide(subtract(14.50, 9.75), subtract(14.50, 7)), subtract(const_1, divide(subtract(14.50, 9.75), subtract(14.50, 7))))