Verified Answer :

SolangeG1339

that will be 40 tennis balls in all

taskmasters

I found a problem that discusses tennis balls in cartons and boxes.

1 box contains 10 tennis balls.
1 carton contains 10 boxes of tennis balls for a total of 100 tennis balls.

So, if you buy 4 boxes, you'll get 40 tennis balls. 10 4 = 40
If you buy 4 cartons, you'll get 400 tennis balls.
4 cartons 10 boxes/carton * 10 tennis balls/box = 400 tennis balls.

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