Average of 9 family members is 22.Smallest is 6 year old.What was the average six years ago
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Answer:
16 years
Step-by-step explanation:
average=sum of the their ages/9
22×9=sum of their ages
198=sum of their ages
=9/2(6+l)
6+l=198×2/9
=44
l=38
if their ages are in Arithmetic progression...
their ages are...
a+8d=38
6+8d=38
8d=32
d=4
...
6,10,14,20.....32,38
six years ago their ages ...
0,4,8,..... .28,32
the sum=9/2(0+32)
=144
average six years ago =144/9
=16
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