Given three numbers, first is twice the second and is half of the third. If…
2020
Given three numbers, first is twice the second and is half of the third. If the average of three numbers is 56, then the difference of first and third number is
- A.
12
- B.
24
- C.
36
- D.
48
Attempted by 9 students.
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Correct answer: D
Let the second number be x. Then the first number is 2x, and since the first is half of the third, the third number is 4x.
Average = (x + 2x + 4x) / 3 = 56, so 7x = 168 and x = 24.
The first and third numbers are 48 and 96, so their difference is 48.