The sum of ten and the quotient of a number xxx and 666.

10 + xxx/666

To find the sum of ten and the quotient of a number xxx and 666, you need to divide xxx by 666 and then add the result to ten.

Step 1: Divide xxx by 666.
If you have a specific value for xxx, substitute it in the equation. For example, if xxx = 100:

100 รท 666 = 0.15015

Step 2: Add the result to ten.
Let's continue with the example using xxx = 100:

0.15015 + 10 = 10.15015

Therefore, the sum of ten and the quotient of a number xxx and 666, when xxx is 100, is approximately 10.15015.