a fraction as a part of another fraction? e.g 1/5 of 3/4

to solve do you need to multiply or subtract? How and why please, thanks

A gas tank is 3/4 full. 1/5 of the gas is used. What fraction of the tank is left after?
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1 Answer

Take the fraction and put it into a decimal. 3/4=0.75 take .75 and divide it by 5. =0.15 put that over 100 so 15/100 and simplify =3/20

or

you can cross multiply

3/4 * 1/5= 3/20
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