Question

Suppose that 15 inches of wire cost 45 cents. At the same rate, how much (in cents) will 37 inches of wire cost?

Answer 1

If inches of wire cost cents, this mean that:

$\frac{45}{15}=3$

we pay 3 cents per inch.

Therefore, if we want 37 inches we have to pay:

$37\cdot3=111$

111 cents.

Hence, 37 inches of wire cost 111 cents.