Which equation has the variable, or missing number, in the correct place to match the given situation?

The Mansour family drove a total of 687 miles, starting on Friday and ending on Sunday. They drove 313 miles on Friday and 164 miles on Saturday. How many miles did they drive on Sunday?

1 answer

Let "x" represent the number of miles driven on Sunday.

The correct equation would be:

313 + 164 + x = 687