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Arman, Babken and Cecilia decided to compete in running a distance of
100m. When Arman was at the finish line, Babken was 10m behind him.
When Babken was at the finish line, Cecilia was 10m behind him. How far
was Cecilia behind Arman, when he was at the finish line?

 May 17, 2020
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A = Arman

B = Babken

C = Cecilia

 

B = A - 10

C = B - 10

 

C = A - 10 - 10 = A - 20
C = 100 - 20 = 80m

When Arman was at the finish line 100m away, Cecilia ran 80m, which is 20m away from the finish line.

 May 17, 2020

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