1.

A man worked 15 hours a day for the first 4 days, 14 hours a day for the next 3 days but did not work on the 8th day. Then on the average how much did he work in the first eight days?1). 12 hours 40 minutes2). 21 hours 45 minutes3). 10 hours 45 minutes4). 12 hours 45 minutes

Answer»

Average = Sum of observations/Number of observations

Given,

A man worked 15 hours a day for the FIRST 4 days

∴ Time the man worked in first 4 days = (15 × 4) hours = 60 hours

A man worked 14 hours a day for the next 3 days

∴ Time the man worked in next 3 days = (14 × 3) hours = 42 hours

And, he did not work on the 8th days

∴ Total AMOUNT of time the man worked in 8 days

= 60 hours + 42 hours + 0 hours = 102 hours

∴ Average working time

= 102/8 hours

= 12.75 hours

= 12 hours + 0.75 hours

= 12 hours + 45 minutes = 12 hours 45 minutes


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