Modded SAT Question Bank
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Test
Math
Domain
Algebra
Skill
Linear equations in one variable
Difficulty
Easy
ID: 2f0a43b2
Modded SAT Question Bank by Abdullah Mallik

If x8=5, what is the value of 8x?


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Correct Answer: .2,  1/5
Rationale

The correct answer is 15. Since the number 5 can also be written as 51, the given equation can also be written as x8=51. This equation is equivalent to 8x=15. Therefore, the value of 8x is 15. Note that 1/5 and .2 are examples of ways to enter a correct answer.

Alternate approach: Multiplying both sides of the equation x8=5 by 8 yields x=40. Substituting 40 for x into the expression 8x yields 840, or 15

Question Difficulty: Easy
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