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

Numbers of boys and girls are x and y respectively. Ages of a girl

1.	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
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">x + y</td></tr><tr><td style="text-align: center;">bx + ay</td></tr></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">bx + ay</td></tr><tr><td style="text-align: center;">x + y</td></tr></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">ax + by</td></tr><tr><td style="text-align: center;">x + y</td></tr></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">x + y</td></tr><tr><td style="text-align: center;">ax + by</td></tr></table>
Answer» D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;">x + y</td></tr><tr><td style="text-align: center;">ax + by</td></tr></table>

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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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