Question

De Andrea is studying metals. She finds out that the ratio of chromium to nickel instainless steel is 9 to 4. If De'Andrea has 27 pounds of chromium, how many pounds ofnickel will she need to forge stainless steel? Show your work.

Answer 1

Ratio:

chromium / nickel = 9/4

27 pounds of chromium

x pounds of nickel

Replacing:

27/x = 9/ 4

Solve for x

Cross -multiply:

27 (4) = 9x

108 = 9x

Divide both sides by 9

108/9 = 9x/9

12 = x

Answer:

She will need 12 pounds of nickel