Six numbers are arranged in decreasing order. The average of first five numbers is 30 and th average of last five numbers is 25. The difference of the first and the last number is.
A. 25
B. 5
C. 30
D. 20
Solution(By Examveda Team)
Let Number areX, X-1, X -2, X -3, X -4 and X -5.
Now, according to question,
(X + X -1 + X -2 + X -3 + X-4)/5 = 30
5X - 10 = 30
X = 8
Difference between first and last number,
= X - X + 5 = 5.
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