Question

If two times a certain number is added to 11, the result is 20.

Which of the following equations could be used to solve the problem?

2x = 20
2(x + 11) = 20
2x = 11 + 20
2x + 11 = 20

Answer 1

2x + 11 = 20

Explanation:

let's start by assigning the variable x to certain number , if we two times a certain number we got 2x, and if we added to 11 the result is 20. So, ordering the equation we will obtain:

2x + 11 = 20

Answer 2

2x+11=20

EXPLANATION

Let the number be x.

Two times this number is 2x

If 11 is added to two times the number, the expression becomes;

2x+11

If the result is 20, then we equate the expression to 20 to get:

2x+11=20

The correct choice is the last option;