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?
A67.67
B65.67
C61
D66.67
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E and F can do a work in 10 days. If E alone can do it in 30 days, F alone can do it in _____ days.
Two pipes A and B can fill a tank in 24 minutes and 32 minutes respectively. If both the pipes are opened simultaneously, after how much time should A be closed so that the tank is full in 20 minutes?
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