If 15 envelopes cost Rs. 11.25, what is the cost of 20 such envelopes?
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Answer:
Step-by-step explanation:
15 envelopes = 11.25 rupees
Therefore, 1 envelope = 11.25 ÷ 15
= 0.75 rupees
20 envelopes = 0.75 × 20
= 15 rupees
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