8th grade
posted by Anonymous .
Sam Squeeze has 10 quarts of a drink that is 60% organge juice. how much pure orange juice must he add to get a drink that is 75% orange juice?

At the start there must be 6Q orange and 4Q water.
Let the total final volume =V
and the volume of orange added =v
so at the end
10Q+v=V..........1
and
(6Q+v)/V=0.75 or
6Q+v=0.75V.......2
solve the two equations (1 and 2) to find v