Question

Please I need help on this question!!???

Answer 1

18in x 40in  Half of 80 is 40, half of 36 is 18
9in x 20in  1/4 of 80 is 20, 1/4 of 36 is 9

Answer 2

You just set up a proportion. 
36/80=18/x
x= 40
36/80=x/20
x=9

The first answer is 40, and the second is 9

hope this helps (: