an alloy of zinc and copper contains the metals in the ratio 5 : 3 . the quantity of zinc to be added to 16 kg of the alloy so that the ratio of the metal may be 3 : 1 is :
"5 / 8 * 16 = 10 3 / 8 * 16 = 6 ( 10 + x ) / 6 = 3 / 1 = 8 answer : c"
subtract(multiply(multiply(divide(3, add(5, 3)), add(const_10, 16)), 3), multiply(divide(5, add(5, 3)), add(const_10, 16)))