a mixture of 70 liters of wine and water contains 10 % water . how much water must be added to make water 12 ½ % of the total mixture ?
"70 * ( 10 / 100 ) = 7 wine water 87 1 / 2 % 12 1 / 2 % 87 1 / 2 % - - - - - - - 63 12 1 / 2 % - - - - - - - ? = > 9 - 7 = 2 answer : d"
divide(subtract(multiply(divide(12, const_100), 70), multiply(divide(10, const_100), 70)), subtract(const_1, divide(12, const_100)))