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3 years ago

Three Friends all have ages that are consecutive integers. The sum of their ages is 48. What is the age of the oldest friend?

Mathematics

2 answers:

zlopas [31]3 years ago

3 0

The oldest friend is 17 years old. 15+16+17. 5+6=11+7=18. 18+10+10+10= 48. get my level B) jk

Ksenya-84 [330]3 years ago

3 0

"The sum of their ages is 48" means x + (x + 1) + (x + 2) = 48

x + x + 1 + x + 2 = 48 

x + x + x + 1 + 2 = 48 

3x + 3 = 48 

3x = 48 - 3 

3x = 45 

x = 45/3 = 15 

So if the youngest is 15 (x = 15), then the oldest is x + 2 or 15 + 2 = 17

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Then, $\sigma=\sqrt{\dfrac{76}{10}}=\sqrt{7.6}=2.76$

Hence, the standard deviation of his measurements = 2.76 g

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Erica earned a total of $50,450 last year from her two jobs. The amount she earned from her job at the store was $1,250 more tha

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