How many kgs of sodium must be added to 60kg of 8 of a solution of sodium and water to increase it t......

How many kgs of sodium must be added to 60kg of 8% of a solution of sodium and water to increase it to a 30% solution?
19.98kg
14kg
57kg
18.85kg

Amount  of sodium in 60 kg solution= (8/100)60kg = 4.8
Let x kg of sodium be added.
Then,  (4.8+x)/(60+x)= 30/100
480+100x =  1800+30x
70x=1320
x =18.85 kg

By: bhavesh kumar singh