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Here’s a little math exercise for you:

To build a levee 7 excavators move the required earth to the contruction site within 40 days. Six days into the work, two excavators are damaged and cannot be used for 14 days.

How many days will be necessary to move the earth to the construction site now?

And while you’re at it, listen to some Italian music.

Well done, you were right on target: Here‘s how my book says it’s done.