Question

Suppose that 12 inches of wire costs 48 cents.

At the same rate, how much (in cents) will 31 inches of wire cost?

Answer 1

• 124 cents

Explanation:

Solve using ratios since this is a proportional relationship:

• 12/48 = 31/x
• 1/4 = 31/x
• x = 31*4
• x = 124 cents

Answer 2

It will cost 124 cents to buy 31 inches of wire.

Explanation:

12 inches costs 48 cents

1 inches will cost her
`(48)/(12)` → 4 cents

Then 31 inches will cost: 31 * 4 → 124 cents