GED Practice Test: Video 1 Answers (25 Questions)

Question 1

What is 15% of 80?

Accepted Answer

12

Answer

10% of 80 is 8 and 5% is 4, so 15% is 12. Choosing 10 or 16 comes from mis-adding the 10% and 5% pieces.

Question 2

Solve for x: 3x + 5 = 20.

Accepted Answer

5

Answer

Subtracting 5 gives 3x = 15, so x = 5. Answer 15 forgets to divide by 3.

Question 3

What is 3/4 + 1/8?

Accepted Answer

7/8

Answer

3/4 equals 6/8, and 6/8 + 1/8 = 7/8. Adding tops and bottoms (4/12) is a common mistake.

Question 4

What is the slope of the line y = 2x - 3?

Accepted Answer

2

Answer

In y = mx + b, m is the slope, so the slope is 2. The value -3 is the y-intercept, not the slope.

Question 5

What is the average of 4, 8, and 12?

Accepted Answer

8

Answer

4 + 8 + 12 = 24, and 24 divided by 3 is 8. Ten would be the average of 8 and 12 only.