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.
+505 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!
