From the fact that the long accounts for 3/8 of the total, we can know that the short accounts for 5/8 of the total, so the long is 3/5 of the short. Similarly, we can know that the long one plus 20 long ones is 7/5, but now the original short ones have not changed, and the long ones have increased by 20, so the share has increased by 7/5-3/5 = 4/5, and 20 * 4/5 =.

It can also be 25×7/5=35 (the number of schools now), 35+25=60.