Question

equation for the cost of cotton cloth is rs 50 per meter and cost of silk cloth is 100 per meter. mohan has rs 1390.how many meters of cotton cloth and os silk cloth can he buy?

Answer 1

Answer :

We can form a equation with the given information , As :

Let Mohan buy total cotton cloth = x m
And
Mohan buy total silk cloth = y m

So , we get equation from given condition ( the cost of cotton cloth is rs 50 per m and cost of silk cloth is 100 per m . mohan has rs 1390. )

50x + 100y = 1390 -------- ( 1 ) ( Ans )

But we can't find how many metres of cotton and silk cloth he can buy , As here some information is missing to solve this

If here is given that total cloth Mohan bought is 20 m , then we can find how many metres of cotton and silk cloth he can buy
from above information we get our second information

x + y = 20 -------------- ( 2 )

Now we multiply by 50 on both hand side ,we get

50x + 50y = 1000

Now we subtract this equation from our first equation , we get

50y = 390

y = 7.8 , Substitute that in equation 2 , we get

x + 7.8 = 20

x = 12.2

So,
we can say
Length of cotton cloth bought = 12.2 m
And
Silk cloth = 7.8 m