A solution contains 30% of substance S and 70% of substance T by weight. If the solution has a total mass of 1200 grams, and 300 grams of substance S are added to it, what is the new percentage concentration of substance S in the solution?
Show answer & explanation
Correct answer: B
Explanation
Initially, substance S = 1200 × 30/100 = 360 grams
After adding 300 grams of S, S = 360 + 300 = 660 grams
New total mass = 1200 + 300 = 1500 grams
New percentage concentration = 660/1500 × 100 = 44%