Question
After 60 litres of petrol was poured into an empty storage tank, it was still 10% empty. How much petrol (in litres, rounded off to two decimal place) must be poured into the storage tank in order to fill it?
The correct answer is
6.67
\(C=\frac{60}{0.9}=\frac{200}3;\quad C-60=\frac{20}3\approx6.67\text{ L}\)
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