To solve this problem, we need to determine the value of x, which represents the number of quizzes Randy has taken.
We know that Randy got scores of 90, 98, 92, and 94 in his first x quizzes.
His goal is to get a 94 average on his 5 quizzes. To reach this average, he should get a score of 96 in the fifth quiz.
Let's calculate the sum of Randy's scores in his first x quizzes:
90 + 98 + 92 + 94 = 374
To reach a 94 average on 5 quizzes, the sum of all 5 scores should be 94 * 5 = 470.
Therefore, the score Randy should get in the fifth quiz is 470 - 374 = 96.
So, the value of unknown variable x is 4. Randy has taken 4 quizzes before the fifth one.
#### 4
The answer is: 4
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Randy got 90, 98, 92, and 94 in his first x quizzes. His goal is to get a 94 average on his 5 quizzes. He should get a score of 96 in the fifth quiz to reach his desired average.

### Answer:
