Question

A 60-litre tank was full of oil. Sam used 40% of it and poured the rest into a 40 litre tank. (i) What percent of the 40 litre tank was filled with oil? (ii) If sam used 3 litres of oil daily, what percent of oil in the 40 litre tank would be used in 10 days?

Answer 1

Amount of oil in the tank= 60 Liter
Percentage of oil used by Sam= 40%
Liters of oil used by Sam= 40÷100 *60=24
Liters of oil left in tank=60 - 24 = 36 Liter
(i) Capacity of oil tank= 40 liters
Liters of oil left with Sam= 36 Liter
So
Percentage of oil filled in tank= 36÷40*100=90
(ii) Liters of oil used every day= 3 liters
Days mentioned= 10 days
Amount of oil used in 10 days= 10*3=30 Liter
Percentage= 30÷40*100=75%