Question

25% of the total quantity of oil is 40 litres

Answer 1

25%=40 litres


40/25*100=160 litres

So net quantity is 160 litres

Answer 2

Hey friend!
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let the total  quantity be x

25/100*x=40
25x=40*100
25x=4000
x= 4000/25
x=160

the total quantity is 160..

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Hope this helps!

@crystinia