Mathematics: The mean of seven numbers is 12.0. when one new number is added, the average of new numbers becomes 12.5. what is the new number?

The mean of seven numbers is 12.0. when one new

Ответ:

Tyrant4life

31.05.2020

Mean of the 7 numbers = 12.0
Total of the 7 numbers = 12.0 x 7 = 84

Mean of the 8 numbers = 12.5
Total of the 8 numbers = 12.5 x 8 = 100

The 8th number is 100 - 84 = 16

The new number is 16.

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Ответ:

Bvrz6198

18.06.2021

Mathematics

Perimeter of triangle is (x+14) + (x+ 17) + (8x+9) = 10x + 40

Perimeter of hexagon 5x * 6 = 40x

Since you want the perimeters to be equal

40x = 10x + 40

30x = 40

X =3/4 = 0.75

Hope this helps

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The mean of seven numbers is 12.0. when one new number is added, the average of new numbers becomes 12.5. what is the new number?

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