Question

2 times the sum of a number and 5 is 20

Answer 1

The number is 5. Steps shown below

Answer 2

$2(x+5)=20\\ \\ 2x+10=20\\ \\ 2x=20-10\\ \\ 2x=10\\ \\ x=5$

Confirming the other answer. 5 is correct.

Hope this helps!