a) 2 numbers have a HCF (highest common factor) of 18 and LCM (lowest common multiple) of 360. What could the 2 numbers be?

b) Emily thinks of 2 numbers. The HCF of the two numbers is 1. The LCM of the 2 numbers is a multiple of 40. Write down 2 possible numbers that Emily could be thinking of.

c) Niamh thinks of 2 numbers. The HCF of the two numbers is 8. The LCM of the two numbers is a multiple of 5. Write down 2 possible numbers that she could be thinking of.

Please help, and include an explanation as I would like to understand it!