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Numbers of boys and girls are ‘x’ and ‘y’ respectively. Ages of a girl and a boy are ‘a’ years and ‘b’ years respectively. The average age (in years) of all boys and girls is
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x + y bx + ay -
bx + ay x + y -
ax + by x + y -
x + y ax + by
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Correct Option: C
According to question ,
Total age of boys = ap years
Total age of girls = bq years
| ∴ Required average = | ap + bq |
| p + q |
