In a pet shop, there are cats and birds. If heads are counted, there are 200 and of legs are counted, there are 580. How many birds are there?

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100

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110

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None of these

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Solution

The correct option is D
110

$Average legs per head = \frac{580}{200} = 2.9$

$\therefore$ Cats :Birds = 0.9 : 1.1 = 9:11

$∴ No.of Birds = \frac{200}{20} \times 11 = 110$

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In a pet shop, there are cats and birds. If heads are counted, there are 200 and of legs are counted, there are 580. How many birds are there?

The correct option is D 110 Average legs per head=580200=2.9 Cats :Birds = 0.9 : 1.1 = 9:11 ∴No.of Birds=20020×11=110

The correct option is D
110

$Average legs per head = \frac{580}{200} = 2.9$

$\therefore$ Cats :Birds = 0.9 : 1.1 = 9:11

$∴ No.of Birds = \frac{200}{20} \times 11 = 110$