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To assemble my model of a sailboat I need some raft wood slats. In the modeling shop they sell them in boxes of a dozen and also in loose units although they are somewhat more expensive. So I ordered several boxes and some loose units to complete exactly what I needed.

As I had no money on me, the clerk, who is my friend, pointed it in my account, handed me the bag with the order and I left.

When I got home, I discovered that the clerk was wrong and that he had given me as many boxes as single units I had asked for and as many single units as boxes I had asked so that I have exactly half the slats I needed.

**How many slats do I need to assemble the model?**

#### Solution

If we call * X* to the number of boxes e

*to the amount of loose units*

**Y**Y

*to the total slats I need we have to:*

**T**If I equal both equations to eliminate T we have to

Where do we get that:

This equation has infinite integer solutions but since the number of single units will be less than 12 (since if I wouldn't ask for a complete box) the only possible solution is X = 23 and Y = 10. I ordered 23 boxes and 10 units that are **286 slats** and yet they gave me 10 boxes and 23 slats that are 143 slats, exactly half of what I need.

Anything can be

Excuse for that I interfere... At me a similar situation. Is ready to help.

Competently written and very convincing, tell us in more detail how you yourself worked it out

You have hit the mark. I think, what is it excellent thought.