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Vlad1618 [11]
3 years ago
13

The mean of 4 numbers is 15. 3 of the numbers are 18, 14 and 12. What is the other number?

Mathematics
1 answer:
Kisachek [45]3 years ago
4 0

Answer:

Call the numbers a, b, c, d. What does it say if their mean is 15? That would be that added together then divided by 4 you get 15. So the number before you divided by 4, which is the sum, was 60. If you know some algebra, the equation (a+b+c+d)/4=15 gives the sum of 60 when you multiply both sides

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<span>4x−3y=12
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It's important that you check this answer by subst. (-3, -8) back into either one of the original equations.

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