Question

What is the 1st mistake...

Answer 1

`\Large \boxed{\mathrm{Step \ 4}}`

Explanation:

`20 +20 / 4-2`

Division should be performed first, not subtraction.

`20+5-2`

Answer 2

`\huge\boxed{Step \ 3}`

Explanation:

In Step # 3, We need to divide rather than to subtract. So, the first mistake is done in step 3.