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The average of the first and the second of three numbers is 5 more than the average of the second and the third of these numbers. What is the difference between the first and the third of these three numbers?1). 152). 93). 64). 10 |
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Answer» Let the three numbers be X, Y and Z The average of the first and second number is (X + Y)/2 And the average of the second and THIRD numbers is (Y + Z)/2 We find the difference between these TWO, and it WOULD equal 5: ⇒ (X + Y)/2 - (Y + Z)/2 = 5 ⇒ (X – Z)/2 = 5 ⇒ X – Z = 10 |
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