A milk cooler was 3/5 full of milk, 1/4 of that milk was sold, only 360 litres remained in the cooler. how many litres does the cooler have when it is 5/8 full?
3/5 * 3/4 = 9/20
so, if the full amount is x, then
9/20 x = 360
x = 360 * 20/9
5/8 of x is thus
(5/8)(360)(20/9) = ?