Sum of a number and its double

The sum of a number and its double is 69.  What is the number?
A.)  46.6
B.)  34.5
C.)  23
D.)  20

x = the number
2x = its double   {double a number is multiplying by 2}

x + 2x = 69   {the sum of a number and its double is 69}
3x = 69   {combined like terms}
x = 23   {divided each side by 3}

C.)  23

Check
- the sum of 23 and its double, 46, is 69
23 + 46 = 69 ☑

- Algebra House