If 15 envelopes cost Rs 11.25, what is the cost of 20 such envelopes?

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Solution

Cost of 15 envelopes = Rs 11.25
Cost of 1 envelope = Rs $\frac{11.25}{15}$

∴ Cost of 20 envelopes = $\frac{11.25}{15} \times 20$ = Rs 15

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