What do i need to multiply by to decrease by 42%?

Hi there!~

So first off we need to use a variable to solve the given percentage, lets use "y" (This can also be used as any other letter, most commonly can be known as "x")

The formula is ""

And because we are increasing, we would use that ^

So for us we get 0.58 as an answer. 

20y5 times 2 is 1010 times -2 is -20, plus y

11/2.2 = 5 inches for the length 8.5/2.2= 3.86 inches for the width