Answer:
40
Explanation:
The first step is to multiply 20 by 1. Whenever you multiply something by 1, it will always stay the same no matter what.
20*1=20
The next step is to multiply by 2. When multiplying anything by two, it is the same as adding the same number to itself. so
20*2=40 or 20+20=40
Hope this helps. Feel free to ask any follow-up questions if you are still confused
Have a great day! :)