Question

the cost of 15 envelopes is rupees 37.50 . how many envelopes can be bought for rupees 300? what will be the cost of 20 envelopes

Answer 1

cost of 1 envelope=37.5/15=2.5
no.of envelopes in rs.300=300/2.5=120
cost of 20 envelopes=20*2.5=50