70 is 40% of what number?

1 Answer
MeneerNask
Sep 14, 2016

If #70harr40%# then what is #Xharr100%#. We use ratio's

Explanation:

#70/(40%)=X/(100%)-># cross-multiply:

#40%*X=70*100%->X=(70*100cancel%)/(40cancel%)=175#

Check your answer:
#(40cancel%)/(100cancel%)*175=70# -- check!

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