Petunia's Rolls Royce uses 15L of gas per 100 km. How many litres of gas would she need to go on a 820 km trip?
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15 l per 100 km
x liter per 820 km
on cross multiplication
(820×15)/100=x
12300/100= x
123liter =x
in total 123 liter of gas will be required to travel 820 km.
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