Question

average age of 5 boy is 16 years of which that of 4 boy is 16 years 3 months what is the age of 5 boy is​

Answer 1

average age of 5 boys :

16 yrs

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sum of their ages :

average age * no. of boys

16 * 5

80 yrs

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sum of their ages :

80 yrs

80 * 12 months

960 months

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average age of 4 boys :

16 yrs 3 months

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average age in months :

16 * 12 + 3 months

192 + 3 months

195 months

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sum of ages of 4 boys :

no. of boys * average age

4 * 195 months

780 months

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age of 5th boy :

sum of ages of 5 boys - sum of ages of 4 boys

960 months - 780 months

180 months

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180 months :

$\frac{180}{12} \: yrs \\ \\ 15 \: yrs \:$

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$\bold{\: age \: of \: 5th \: student \: is \: 15 \: yrs \: }$

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