Let us assume the unknown number is n.
Given statement " The number that is twice as much as five more than a number a."
Twice of a is = 2 times of a= 2a.
Now, it is said twice of that number of 5 more than a.
So, we can set an equation as
2a = a +5.
Subtracting a from both sides, we get
2a - a = a-a +5
a = 5.
Therefore, unknown number a is 5.
