There will be 25 50000 scale toposheets in one 250000 scale toposheet because 250,000 divided by 50,000 equals 5, and 5 squared is 25.
0.2 * 250000 = 50000
250000
500000
2.68
0.0004
250000
684.9315
Anywhere between 50000-250000 depending on what they fly and where.
83333.3333
250
25000