Question

What is `20 - 16 -: 8 + 7`?

Answer 1

25

Explanation:

Multiply or divide is of greater order of operation that add or subtract. So we do the divide first.

Write as `" "20-16/8+7` we have now applied the process without actually working that stage out. Now we work it out:

`16/8 or 16-:8 = 2` giving

`20-2+7`

Due to discussion and the possibility of some readers not being aware of certain mathematical conventions the comment I put at this point has been removed.

`20-2+7=25`