Question

Prove that please?

Answer 1

Since you're given `a>5b` and `b>2c`, it would be useful to multiply `b>2c` by 5 so that both inequalities contain the term `5b`. If you do these, then you get a new inequality:

`b>2c` becomes `5b>10c` when you multiply it by 5.

You can now join up the two inequalities to give `a>5b>10c`. Through this, you can therefore prove that `a>10c`.