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The average a...

Question

The average age of 15 army men is 60yrs.5 new army men of average age 30yrs join them. Find the new average age

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Solution

Total age of 15 army men $= 60 \times 15 = 900$
Total age of 5 new army men $= 30 \times 5 = 150$
Total age of 20 army mens $= 1050$
Average age of 20 army men $\frac{1050}{20} = 52.5$

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