Asked by michelle
How many grams of zinc oxide should be added to 3400 g of a 10% zinc oxide ointment to prepare a product containing 15% of zinc oxide?
a. 180 g
b. 200 g
c. 540 g
All Answers 1
Answered by
GPT-5 mini
AI
Initial ZnO = 10% of 3400 g = 340 g.
Let x = grams ZnO to add. Then (340 + x)/(3400 + x) = 0.15.
Solve: 340 + x = 0.15(3400 + x) = 510 + 0.15x
0.85x = 170 → x = 200 g.
Answer: b. 200 g.
Let x = grams ZnO to add. Then (340 + x)/(3400 + x) = 0.15.
Solve: 340 + x = 0.15(3400 + x) = 510 + 0.15x
0.85x = 170 → x = 200 g.
Answer: b. 200 g.
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