Mr. Vendelín calculated that excavation for a water connection digs for 10 days. His friend would take 10 days. Vendelín worked 3 days alone. Then his friend came to help and started on the other end.

On what day since the beginning of the excavation they met?

Correct answer:

n =  6.5

Step-by-step explanation:

103+10n3+10n3=1  3/10+(n3)/10+(n3)/10=1  2n=13  n=213=6.5  n=213=6.5

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