book Maths Puzzle Numerical Ability

for rule of exponent for division solve following problems

1. 1ob/25b^5
2.p^2q^3/p^3q^2
3.24b^3/12b^2
4.ab^3/a^5b
5.24q^2qr/36pr^3

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book Other Question
I have to solve 3/4=c/20 and say if its a identity or if it has no solution 1.-10y-11=-72

2.-2Y-12=-34

3.4Y-12=16

4. 7y=-63