how many liters of water must be evaporated from 50 liters of a 3 percent sugar solution to get a 5 percent sugar solution ?
"3 % sugar solution means that currently there are 1.5 liters of sugar and this amount must be 5 % of a reduced final amount ( 50 - x ) 1.5 = 0.05 * ( 50 - x ) 0.05 x = 1 x = 20 answer e"
subtract(50, multiply(divide(50, const_100), 5))