2002
Mathematics
67ca00ce0c643c71d77dee1f
The mean of a set of six numbers is 60. If the mean of the first five is 50, find the sixth number in the set.
A.
105
B.
100
C.
95
D.
110
Correct Answer: 110
Explanation
Let the sum of the first five numbers and the sixth number be x and t respectively. (x+t)/6 = 60 ⟹ x + t = 360 x/5 = 50 ⟹ x = 250 ∴ t = 360 − 250 = 110
Let the sum of the first five numbers and the sixth number be x and t respectively. (x+t)/6 = 60 ⟹ x + t = 360 x/5 = 50 ⟹ x = 250 ∴ t = 360 − 250 = 110THIS WEEK's
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