Lets write this out:-
20 ÷ 2 × (5+5).
To answer this we will use the Oder Of operations.
PEMDAS.
Since there is parenthesis, we will 1st solve that.
20 ÷ 2 × (5 + 5)
20 ÷ 2 × (10)
Next we will do division.
10 × (10).
Finally multiply.
100.
So, 20 ÷ 2 × (5 + 5) = 100.
Hope I helped ya!!