Question

Alexis needs 280 screws to finish her deck.She bought 3 boxes of screws with 40 screws in a box.She had 168 screws.How many screws will she have left over when she finishes the deck?

Answer 1

Answer: 8 screws

Explanation:

1. You know that Alexis bought 3 boxes of screws with 40 screws in each box, then, to calculate the total number of screws she bought, you must multiply 3 boxes by 40 screws. Then:

`total=3*40\ screws\\total=120 \ screws`

2. Then, if she had 168 screws and she bought 120, now she has :

168 screws+120 screws=288 screws

3. So to calculate the number of screws that she will have left over when she finishes the deck (which you can call
`x`), you must subtract 288 screws and 280 screws. Therefore, you obtain the following result:

`x=288\ screws-280\ screws=8\ screws`