Caleb was building a birdhouse. He needed 2 boards that were each 6 inches long and one board that was 18 inches long. He was then able to cut the boards into pieces to use.

30 inches

Step-by-step explanation:

Here is the complete question:

Caleb was building a birdhouse. He needed 2 boards that were each 6 inches long and one board that was 18 inches long. He was then able to cut the boards into pieces to use. What was the total length of the boards that he needed?

From the question, we are informed that Caleb needed 2 boards that were each 6 inches long and one board that was 18 inches long.

The total length of the boards that he needed goes thus:

For the first part, we are told that Caleb needed 2 boards that were each 6 inches long. This means that he needs a total of (2 × 6 inches) = 12 inches.

We are also told that he needed one board that was 18 inches long. This mean the total length of the birds needed will be the addition of the length of all the three boards. This will be:

= 12 inches + 18 inches

= 30 inches

Let = number of nickels
Let = number of dimes
Let = number of quarters

(1)
(2) ( in cents )
(3)

This is 3 equations and 3 unknowns,
so it's solvable
Substitute (3) into both (1) and (2)
(1)
(2)

(1)
(2)
multiply both sides of (1) by
and subtract (2) from (1)