Write an equation and solve for the unknown number.

Question

Twice a number, increased by 3 is 7.
The number is 2
The number is 8
The number is 20
The number is 5

Answer 1

Let's assume the unknown number is represented by "x".
The equation based on the given information is:
2x + 3 = 7

Now let's solve for x:
Subtract 3 from both sides of the equation:
2x = 4

Divide both sides by 2:
x = 2

Therefore, the unknown number is 2.