Question
$x+y=8 ; x-y=2$
✓
Answer
$x=5, y=3$
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→|
Age in years
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$0-10$
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$10-20$
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$20-30$
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$30-40$
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$40-50$
|
|
No. of persons
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$5$
|
$25$
|
?
|
$18$
|
$7$
|