10 is 20% of what number?

1 Answer
MeneerNask
Dec 31, 2016

If we know that #10harr20%# then what #harr100%#

Explanation:

#10harr20%=Xharr100%#, or:

#10/(20%)=X/(100%)#

You may multiply the left part by #1#, disguised as #5/5#:

#(5xx10)/(5xx20%)=X/(100%)->50/(100%)=X/(100%)->X=50#

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