Paper 1 · Mathematical Reasoning and Aptitude
UGC NET December 2021 June 2022 (09.07.2022) Shift-II
A man bought 13 chairs and 5 tables at a total cost of Rs. 8280. If the average cost of a table is Rs. 1227, what is the average cost of a chair?
ARs. 165 ✓ Correct
BRs. 175
CRs. 155
DRs. 166
Correct answer: (A) Rs. 165 — The average cost of a chair is Rs. 165.
Explanation
★The average cost of a chair is Rs. 165.
★The total cost of everything is Rs. 8280.
★Five tables at Rs. 1227 each cost 5 times 1227, which is Rs. 6135.
★So the thirteen chairs together cost 8280 minus 6135, which is Rs. 2145.
★Dividing Rs. 2145 by thirteen chairs gives Rs. 165 each.
★The known table total is removed to isolate the chair total.
★The chair average is then the chair total divided by the chair count.
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