Hi, so before I start: PRODUCT = Multiplication and SUM = Addition.
In other words, you are saying: The multiplication of 6 and the addition of 3 and 20.
Lets start with 3 and 20. In other words it is 3+20 which is equal to =23.
Now considering you only have one number for the product, I'm presuming you mean the product of 23 and 6. In that case,
23 x 6 = 138
