Set up an equation that can be used to solve the problem. Solve the equation and answer the question asked.
-The difference of twice a number and 10 is 20.
A) x - 2 ·10 = 20; 40
B) 10 - 2x = 20; - 5
C) 2x - 10 = 20; 15
D) 2x + 10 = 20; 5

Question

Quizplus · Accepted Answer

Let the number be x.

"Twice a number" is 2x.

The "difference of twice a number and 10" is 2x - 10.

We know that 2x - 10 is equal to 20, so we can set up the equation:

2x - 10 = 20

Adding 10 to both sides, we get:

2x = 30

Dividing both sides by 2, we get:

x = 15

Therefore, the answer is C, 2x - 10 = 20, and the solution is x = 15. Let x be the number.
According to the problem, the difference of twice a number and 10 is 20 can be written as:
2x - 10 = 20
Solving for x, we can add 10 to both sides:
2x = 30
Dividing both sides by 2, we get:
x = 15
Therefore, the answer is C.

Set Up an Equation That Can Be Used to Solve