Question

What is `15-:5+6*3`?

Answer 1

`15div5+6*3=color(blue)(21)`

Explanation:

Following the rules of PEDMAS
Division and Multiplication are performed (left to right) before Addition.

Therefore
`15div5+6*3`
`color(white)("XXX")=3+6*3`
`color(white)("XXX")=3+18`
`color(white)("XXX")=21`

Answer 2

`21`

Explanation:

Count the number of terms first and then make sure that each term gives an answer.

In the last line the values of the terms are added and subtracted.

`color(red)(15 div 5) + color(blue)(6xx3)" "` has 2 terms

=`color(red) 3 + color(blue)18`

=`21`