Question

15 envelops cost rs 10.50. how many envelopes can be brought for rs 70? what will be the cost of 35 envelops

Answer 1

15envelopes = 10.5 rs
1 envelope = rs 10.50/15
In 70rs no of envelopes =70*15/10.50
=70*150/105
=100
35envelope cost=10.50/15*35=24.5rs