The average of x,x+20,x?1, and x?15 is 10. Find the value of the largest number....
MATHEMATICS
SAT 2021
The average of x,x+20,x?1, and x?15 is 10. Find the value of the largest number.
- A. 12
- B. ?9
- C. 29
- D. 10
Correct Answer: C. 29
Explanation
Recall how to find the mean: Mean/Average=Sum of all valuesNumber of values 10=x+(x?1)+(x?15)+(x+20)/4 4x+4=40 4x=36 x=9 Now, because the question asks you to find the largest number, we need to find the value of x+20. x+20=9+20=29
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