SAT Math Multiple Choice Question 662: Answer and Explanation

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Question: 662

2. The average (arithmetic mean) of three numbers is 50. If two of the numbers have a sum of 85, what is the third number?

  • A. 75
  • B. 70
  • C. 65
  • D. 55

Correct Answer: C

Explanation:

C

Data Analysis (central tendency) EASY

The average of three numbers is 50:

Images

Multiply by 3:

150 = a + b + c

Two of the numbers have a sum of 85:

85 = a + b

Substitute into the previous equation:

150 = 85 + c

Subtract 85 to find c:

65 = c

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