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Mathematical Aptitude MCQ - Averages

11 The average of A, B and C is 50. If D is 10, then what is the average of A, B, C and D?

The total of a, b, and c = 3 × 50 = 150 d = 10
Total of a, b, c, and d = 150 + 10 = 160
Average of a, b, c and d = 160/4 = 40

Subtopics Covered

Averages 13
Calendar Questions 20
Fractions 16
Interest 20
Profit and Loss 20
Ratio Proportion, Percentage and Discounting 44
Time and Distance 17
Venn Diagram 15

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Easy 35%
Medium 40%
Hard 25%

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Question:

A car owner buys petrol at Rs 8 and Rs 10 for two successive years. What approximately is the average cost per litre of petrol if he spends…

A. Rs 9
B. Rs 9.90
C. Rs 8.88
D. None of the above

Correct answer: C

Explanation:

Petrol consumed during 1st year = 4000/8 = 500 Petrol consumed during 2nd year = 4000/10 = 400 Total expenditure = 4000 × 2 = 8000 Total petrol…

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