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WAEC Mathematics 2017 Paper

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Question : 22

Total: 49

The average age of a group of 25 girls is 10year. If one girl, aged 12 years and 4 months joins the group, find the new average age of the group

10.1 years
9.3 years
8.7 years
8 . 3 years

Solution:

x = 10 ; 10 = $\frac{x}{25}$

x = 250

x = $\frac{250+12.4}{26}$

x = 10.09

x = 10.1 years

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