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Nonportrit
Hey there!

Here is your answer:

The proper answer to this question is "40".

Reason:

40/x=100/45
(40/x)*x=(100/45)*x       - we multiply both sides of the equation by x
40=2.22222222222*x       - we divide both sides of the equation by (2.22222222222) to get x
40/2.22222222222=x
18=x
x=18

45% of 40=18

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit

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