The average consumption of petrol for a car for seven months is 110 litres and for next five months it is 86 litres. The average monthly consumption is?

96 litres
98 litres
100 litres
102 litres

Correct Answer: 100 litres

Explanation:

Average = ( sum of consumption of petrol in first 7 months + sum of consumption of petrol in last 5 months. ) / 12
Average = ( 110 x 7 + 86 x 5 ) / 12
=(1200 / 12 = 100 liters

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