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Mary sells boxes of cookies for $4 each.  Henry sells boxes of cookies for $10 each. Each of them sold the same dollar amount. It was the smallest dollar amount for which this was possible.

 Sep 1, 2022
edited by Guest  Sep 1, 2022
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It is just the least common multiple (LCM) you are looking for!

 

Let's check 10 first. 10 x 1 = 10. And this isn't divisible by 4 to make a whole number. 

 

So let's check the next one for 10! 10 x 2 = 20. This IS divisible by 4 to make a whole number! 20 / 4 = 5!

 

So Mary sold 5 boxes of cookies to get to $20 and Henry sold 2 boxes of cookies to get to $20!

 

$20 is the answer!

 Sep 1, 2022

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