Usually when asking for common factors they ask you to compare two or more different numbers but the factors of 32 are:
1, 2, 4, 8, 16, 32
Answer:
Step-by-step explanation:
The given expression is

We will rewrite the expression

When we add the fraction
=
= 8
While Andre says the answer is 
because Andre added the denominator where he has to make a common denominator that should be 4 instead of 8.
Andre made mistake in this step
Picture is given below :
Sense L and W are next to each other you will have to multiply L by W so 2.3 times 4.5 to get A which is 10.35