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02-03-2021
Mathematics

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x, 8, y make an arithmetic sequence. x, y, 20 also make an arithmetic sequence. What is x and y?

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02-03-2021

First sequence with common difference:
8-x=y-8
Second sequence:
20-y=y-x

Solving two simultaneous equations:
x=16-y
20-y=y-16+y
y=12
x=4

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