Paper 1 · Mathematical Reasoning and Aptitude
The average weight of eight articles is 25 kg. If the average weight of three of them is 20 kg, what is the average weight of the remaining five articles?
A26 kg
B27 kg
C28 kg ✓ Correct
DNone of the above
Correct answer: (C) 28 kg — The average of the remaining five is 28 kg, so that is the answer.
Explanation
★The average of the remaining five is 28 kg, so that is the answer.
★The total weight of eight articles is 8 times 25, which is 200 kg.
★The total of the three articles is 3 times 20, which is 60 kg.
★So the total of the remaining five is 200 minus 60, which is 140 kg.
★Their average is 140 divided by 5.
★This gives 28 kg.
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