Question 276407
How many kgs of salt must be added to 24 kg of 20% salt solution in order to increase the concentration of salt to 40%?


salt 100%-------------------- 20%---------------40%  strength

x------------------------------24 kgs-----------x+24 kgs

100%*x+20%*24=40%*(x+24)

1x+4.80=.4x+9.6

x-0.4x=6-4.8

0.6x=1.2
x=1.2/0.6 = 2 kgs