10 chidrens averag age 9year9month 9children average age 8 year11 month what is tenth child age
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Total of 10 children = (9x12 +9) 10=1170 mos
Total of 9 children = (8x12 +11)9=
= 963 mos
Age of 10th child=1170-963=207 mos
=207/12=17 yrs 3 mos
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