Question

The mean of three numbers is 19. If two of them are 10 and 15, find the third
number
​

Answer 1

Answer:

32

Step-by-step explanation:

let the third number be x.

Then, 10+15+x / 3 = 19 (mean)

⇒ 25 +x = 19*3

⇒ x = 57-25

⇒ x = 32

∴ third number is 32.

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Answer 2

Answer:

Given average of 3 numbers = 19

Average=Tota/Numberofitems

⟹Total=Average×Number of items

Therefore,

Total of 3 numbers = 19×3 = 57

Given average of 2 numbers = 10;15

Total of 2 numbers = 10+15 = 25

Therefore,

Third Number = 57–25 = 32

Step-by-step explanation:

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