How do I do the following question a/b means (a divide by b)
I am not going to give you the answers here, but next time you
meet such questions, you can try factorising both the numerator and
the denominator first.
This way, it will be easy for you to perform elimination.
As for Question C, Try to simplify the mini fractions in the
numerator and the denominator first, so that you could easily see
what can be eliminated.