The cost of 35 envelops is ₹ 105. How many envelops can be bought for ₹ 90?

Sum

Envelops purchased by ₹ 105 = 35
Envelopes purchased by ₹ 1 = `35/105`
In ₹ 90, the envelop will be bought = `35/105xx90` = 30

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