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Anita has two sisters and three brothers. The mean of all their ages is 6 years. What will their mean age be 10 years from now? Twenty years from now?
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2 votes
Anita has two sisters and three brothers. The mean of all their ages is 6 years. What will their mean age be 10 years from now? Twenty years from now?

User Zenahr
by
5.6k points

2 Answers

6 votes
16 and 26 just add up those numbers
User Hariharan L
by
5.2k points
0 votes
mean = sum / count
mean = 6
count = 6
x = sum
6 = x / 6

x = 36

In 10 years, the sum will be x+10 = 36 + 10 = 46
mean = 46 / 6 = 7 2/3 = 7.67

In 20 years, the sum will be x+20 = 36 + 20 = 56
mean = 56 / 6 = 9 1/3 = 9.33
User MarcinWolny
by
6.4k points
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