Barbara has 10 shirts with long sleeves
100% of Barbara's shirts is 25
Given: 60% of Barbara's shirts are short sleeves.
That means, 1.0 - 0.6 = 0.4 --> 40% of Barbara's shirts are long sleeves.
We need to find: 40% of 25
0.4 * 25 = 10
10 long sleeved shirts