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Let x = average of the first five prime numbers of the number system and y = average of the first five composite numbers of the number system, then, the difference of x and y is:
  • a)
    1.8
  • b)
    2.8
  • c)
    0.8
  • d)
    None of these
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Let x = average of the first five prime numbers of the number system a...
The first 5 prime numbers of the number system are 2, 3, 5, 7 and 11.
The first 5 composite numbers of the number system are 4, 6, 8, 9 and 10.
So x = 2+3+5+7+11/5 = 28/5 and
y = 4+6+8+9+10/5 = 37/5
So, the required difference = y – x = 37/5 – 28/5  = 37–28/5 = 9/5=1.8
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Community Answer
Let x = average of the first five prime numbers of the number system a...
First five prime numbers:2,3,5,7,11.
average:28/5=5.6 
first five composite number: 4,6,8,9,10.
average:37/5=7.4
difference= 7.4-5.6=1.8 answer.
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Let x = average of the first five prime numbers of the number system and y = average of the first five composite numbers of the number system, then, the difference of x and y is:a)1.8b)2.8c)0.8d)None of theseCorrect answer is option 'A'. Can you explain this answer?
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