Four pupils have an average age of 12years and two other pupils of average age of 10.5years are added. What is the average age of the six pupils?
a
10.5yrs.
b
11yrs.
c
11.5 yrs.
d
12yrs.
e
12.5yrs.
Explanation
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goodlive715
1 year ago
4pupils+2pupils=12yrs+10yrs
6pupils=x
6=22
6=x
cross multiply
6x=132
x=132/6
x=22
22-10.5=11.5
therefore the average age of the 6pupils is 11.5yrs or11 and 1/2yrs
