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Of the three numbers,the first is twice the second and the second is twice the third. The average of the three numbers is 21. find the largest number of the three.
  • a)
    36
  • b)
    38
  • c)
    47
  • d)
    48
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Of the three numbers,the first is twice the second and the second is t...
Given information:
- First number = 2 * second number
- Second number = 2 * third number
- Average of three numbers = 21

Let's assume the third number to be x.
So, second number = 2x
And, first number = 2 * (2x) = 4x

Now, we can write the equation for the average of three numbers as:
(4x + 2x + x) / 3 = 21

Solving this equation, we get:
7x / 3 = 21
7x = 63
x = 9

Hence, the third number is 9.
Using this, we can find the second number as:
2x = 2 * 9 = 18

And, the first number as:
4x = 4 * 9 = 36

Therefore, the largest number is 36, which is option A.
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Community Answer
Of the three numbers,the first is twice the second and the second is t...
Let, third number be X
second number =2x
first number =4x
a/q
21 = (X+ 2x + 4x)/3
63 = 7x
X= 63/7 =9
all three number= 9,18,36
36 is the largest number of the three
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Of the three numbers,the first is twice the second and the second is twice the third. The average of the three numbers is 21. find the largest number of the three.a) 36 b) 38 c) 47 d) 48 Correct answer is option 'A'. Can you explain this answer?
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