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diamong [38]
3 years ago
6

The sum of 3 consecutive odd numbers is 51. What is the second number in this sequence?

Mathematics
1 answer:
Feliz [49]3 years ago
4 0
2n+1+2n+3+2n+5=51\\
6n+9=51\\
6n=42\\
n=7\\\\
2n+3=2\cdot7+3=17
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Answer: The number of stickers she used to cover the length of the spine = 14.

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If she laid the stickers side by side without gaps or overlaps, the number of stickers she use to cover the length of the spine = \text{(Length of spine)}\div (\text{Length of each sticker})

=\dfrac{21}{2}\div\dfrac{3}{4}\\\\=\dfrac{21}{2}\times\dfrac{4}{3}\\\\=\dfrac{7\times2}{1}=14

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