Question

a 60 litre tank was full of oil. Sam used 40% of it and poured the rest into a 40 litre tank. if Sam used 3 litres of oil daily, what per cent of oil in the 40 litre tank would be used in 10 days?



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Answer 1

Capacity of 1stTank =60 litres.
Amount of oil used by Sam=40% of 60 litres.
                                           =(40/100)*60 litres.
                                           =24 litres.
Amount of oil left = (60 - 24) litres
                            = 36 litres.
Acc. to Question, Amount of oil that was left, was poured in 2nd tank with capacity 40 litres.
Now,
Percentage of  oil in 2nd tank=(36/40)*100 %
                                               = 90 %. (1st Part Answer)
Now if 3 litres of oil is being used daily,
Amount of oil used in 10 days = (3*10)=30 litres.
Amount of oil left in the tank = (36-30) = 6 litres.
Now percentage of oil in tank = (6/40)*100 %
                                                     =15%
∴Percentage of oil left in tank = (100 - 15)% = 85% (2nd Part Answer)

Answer 2

quantity of oil in 1st tank = 60 litre

oil used = 40 % of 60

0.4 × 60 = 24 litre

rest oil = total quantity - oil used

= 60 - 24 = 36 litre

In 40 litre tank:
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quantity of oil = 36 litre


1 days consumption = 3 litre

10 days' consumption

= 3 × 10 = 30 litre

oil used in 10 days

= (30 × 100)/ 36 = 83.33 %


oil used in 10 days = 83.33%

Answer:
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oil used in 10 days = 83.33%
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