If you include negative numbers, the list is infinite.
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The numbers are 18 and 20.
224 x 226
The numbers are 2, 4 and 6.
I would list all the factors of 480 (as pairs of numbers whose product is 480). Then find two pairs of numbers (L1,W1 and L2,W2) satisfying these properties. (It won't take long, since there are at most sqrt(480) (rounded down) pairs of numbers whose product is 480, ie. just try the numbers 1,2,3,...,21.) Hope that helps!
Divide 126 by 2 and choose the even numbers on both sides.