2021
Mathematics
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The mean of ten positive numbers is 16. When another number is added, the mean becomes 18. Find the eleventh number
A.
3
B.
16
C.
38
D.
30
Correct Answer: 38
Explanation
Mean of 10 numbers = 16 The total sum of numbers = 16 x 10 = 160 Mean of 11 numbers = 18 Total sum of numbers = 11 x 18 = 198 The 11th no. = 198 - 160 = 38
Mean of 10 numbers = 16 The total sum of numbers = 16 x 10 = 160 Mean of 11 numbers = 18 Total sum of numbers = 11 x 18 = 198 The 11th no. = 198 - 160 = 38THIS WEEK's
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