Question

In a certain​ chemical, the ratio of zinc to copper is 3 to 19. A jar of the chemical contains 646 grams of copper. How many grams of zinc does it​ contain?

Answer 1

102

Explanation:

zinc to copper

3 : 19

x : 646

Find 1 ratio of copper to amount of copper

646 ÷ 19 = 34

1 ratio = 34

so, full answer:

646 ÷ 19 = 34

34 x 3 = 102 zinc