Question

In a 12 ltr. solution of water and salts is 7%. Due to
boiling of solution 4 ltr. water evaporates. Find the
percentage of salt in the remaining solution.
(a) 10%
(b) 25%
(c) 10.5%
(d) 15%​

Answer 1

Answer:

b is the correct answer

solution

7 percent of 12 is 21/25 (which means in 12 Ltr water 21/25ltr is filled with salt)

due to evaporation water left is 12 - 4=8 ltr

let the percentage of salt be x

so x percent of 8 will be 21/25

atp,

x/100 *8= 21/25

x=10.5 percent