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Reika [66]
3 years ago
5

Three consecutive even numbers have a sum between 84 and 96.

Mathematics
1 answer:
ELEN [110]3 years ago
5 0

Answer:

a. 84 < n + (n + 2) + (n + 4) < 96

b. 26 < n < 30


Step-by-step explanation:

Let n = 1st number

n+2   2nd  even number

n+4 = 3rd even number

The sum of these 3 numbers is

n+n+2+n+4

It must be between 84 and 96  (it does not include this 84 and 96)

84< n+n+2+n+4 < 96


Now we need to solve this

Combine like terms

84 < 3n +6< 96

Subtract 6 from all sides

84 -6 < 3n+6-6 < 96 -6

78 < 3n < 90

Divide all sides by 3

78/3 < 3n/3 < 90/3

26 < n< 30


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The perimeter of a building is 78 feet. The width of the building is seven more than three times the length of the building. Wha
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So substitute into the original equation

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—————-

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