If the percentage of Mathematics teachers is increased by 50% and the percentage of Hindi teachers decreased by 25%, then what will be the total number of Mathematics and Hindi teachers together?

390

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379

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459

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480

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None of these

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Solution

The correct option is C
459

New strength of Mathematics teachers = 234 + ( $\frac{1}{2} \times 13 % o f 1800 = 117)$ = 351

New strength of Hindi teachers = $\frac{3}{4} \times 8 % o f 1800 = 108$

Collective strength of both subject teachers = 351 + 108 = 459

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What is the ratio of the number of teachers who teach Mathematics to the number of teachers who teach Hindi?

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