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Unitary Method

The ratio of ...

Question

The ratio of male teachers and lady teachers in a school is $5 : 4$ . If there are $90$ teachers in the school, then the lady teachers are

A

$72$

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B

$18$

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C

$50$

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D

$40$

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Solution

The correct option is D
$40$

Sum of the term of the ratio = $5 + 4 = 9$
Number of lady teachers = $\frac{4}{9} \times 90 = 40$
So the number of lady teachers in school is $40$ .

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