Just break the words down into mathematical symbols.
70%=.7,
we will call the unnamed number X.
So you have (.7)X=42,
divide by .7 to get X=42/.7 or X=42(10/7)=420/7=60.
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42
the answer you are looking for is 70% because 60*.7=42 and .7 is 70% in decimal form to get this you do 42/60 (42 divided by 60)=.7 and .7 multiplied by 100%= 70%
70% of 42= 70% * 42= 0.7 * 42= 29.4
30% off of 42 = 70% of 42 = 42*70/100 = 29.40
100*42/60 = 70%