Question

40m of a dress material cost rupees2160. How many metres can be bought for rupees 1620?

Answer 1

if 4mts of dress material costs rs 2160
then 1m will cost =2160/4
                             = 54
so cloth material borrowed in 1620 rupees is = 1620/54
                                                                         =30
so, 30m of cloth can be bought for rupees 1620

Answer 2

40 m of cloth cost Rs 2160
How many meters will cost Rs 1620?

Ratio of cloth = 40 : x
Ratio of cost = 2160 : 1620  = 216 : 162 = 108 : 81 = 4 : 3

Now, Cost of the cloth is directly proportional to the length of the cloth

40 : x = 4 : 3

4x = 120

x = 30

Cost of 30 metres cloth is Rs 1620