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Wage of Worker

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Wage of Worker

by harsh.champ » Wed Feb 17, 2010 5:08 am
The average wages of a worker during a fortnight comprising 15 consecutive working days was Rs.90 per day. During the first 7 days, his average wages was Rs.87/day and the average wages during the last 7 days was Rs.92 /day. What was his wage on the 8th day?

A. 83
B. 92
C. 90
D. 97
E. 95

The OA is D.
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by abhi332 » Thu Feb 18, 2010 1:27 am
total wages of 15 days = 15 * 90

total wages of First 7 days = 87 * 7
total wages of Last 7 days = 92 * 7

remaining is 8th day wage = 15 * 90 - (87*7+92*7) = 15 * 90 - 7(87+92) = 15 * 90 - 7(179)

now find the unit digit in above expression

15 * 90 will give 0 at unit place

7* 179 will give 3 at unit place

therefore in answer we should have 10 - 3 in unit place = 7

hence answer D
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