Question

A mixture of sand and water contains 20% sand by weight of it 20kg water is evaporated and the mixture now contains 30% sand​

Answer 1

Answer:

IT WILL BE HELPFULL

Step-by-step explanation:

Let the amount of water in the original solution =x kg.

Then the amount of salt present in 15% of this solution =

100

15x

kg=

20

3x

kg.

After 30 kg water evaporates, the amount of water =(x=30) kg.

So, the new concentration =

x−30

20

3x

×100.

Then, by the given condition,

x−30

20

3x

×100=20

⇒4x−120=3x

⇒x=120 kg

So, the quantity of the original solution =120 kg.