Question

Suppose that 18 inches of wire costs 72 cents.

At the same rate, how much (in cents) will 39 inches of wire cost?

Answer 1

39 inches of wire would cost 156 cents

Explanation:

1) Make an Equation

18x = 72

2) Solve for x to determine cost per inch of wire

x = 72/18

x = 4

3. Multiply x value by 39 to get the cost for 32 inches of wire (c)

39x = c

39 (4) = c

156 = c