Average Practice Test 6

Question : 18 of 40

Marks: +1, -0

The average of three numbers is 42. The first is twice the second and the second is twice the third. The difference between the largest and the smallest number is

Validate

Solution:

Let the third number = x
Then, second number = 2x and first number = 4x

∴{x+2x+4x}/3=42

⇒{7x}/3=42

⇒x=18

So, (largest) – (smallest) = (4x – x) = 3x = 54

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