Final answer:
To determine the amount of zinc in a jar when the zinc to copper ratio is 4 to 15 and there are 390 grams of copper, set up a proportion. The calculation reveals that there are 104 grams of zinc, matching option A.
Step-by-step explanation:
To find out how many grams of zinc are contained in a jar of a certain chemical when the ratio of zinc to copper is 4 to 15 and there are 390 grams of copper, we can set up a proportion based on the given ratio:
- Zinc : Copper = 4 : 15
- Zinc : 390 grams = 4 : 15
Let x be the amount of zinc in grams. The proportion can be written as:
x / 390 = 4 / 15
By solving for x, we get:
x = (4 / 15) × 390
x = 104 grams
Therefore, the jar contains 104 grams of zinc, which corresponds to option A.