215k views
13 votes
A student chose a number, multiplied it by 2, then subtracted 138 from the result and got 102. What was the number he chose?

2 Answers

2 votes
Answer: 120

2x - 138 = 102
+138 +138
(x=the missing number)

2x =240

240\2 = 120

x=120
User Robert Menteer
by
8.5k points
4 votes

Answer:

51

Explanation:

let's set the starting number as x

1. x times 2 = 2x

2. 2x- 138

3. result = 102

So, 2x-138 = 102

Now lets work backwards to solve for x.

1. 2x = 102

x = 51

So the starting number was 51.

User Nilda
by
7.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories