Average age of a man and his two twin born on same day is 30 ,year. ratio of ages of father and one

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The average age of a man and his two twin born on the same day is $30 \,year.$ The ratio of the ages of father and one son is $5: 2,$ what is the father's age in $year?$

A

$50$

B

$30$

C

$45$

D

$20$

Solution

Total age of a man and his twin born son

$=30 \times 3=90 \text { years }$

given the ratio of father and his twin son

$=5: 2: 2$

Father's age $=\frac{90}{9} \times 5=50$ $years$

Standard 13

Quantitative Aptitude

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