Let the unknown number be n.
Then 20 + n = 30 : Subtract 20 from both sides gives :-
20 - 20 + n = 30 - 20 : n = 10
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20
Counting 0 as a number, it's 20. Not counting 0, it's 30.
The sum of 20, 30, and 45 is calculated by adding the three numbers together. So, 20 + 30 + 45 = 95. This is because addition is a basic arithmetic operation where you combine the values of the numbers to find the total.
39
600/50 = 12