The first workshop will do the robot itself in 15 days, and the second workshop in 10 days. They started together, but only the second workshop worked after three days. How many days will the work be done?

Correct answer:

t =  8 h

Step-by-step explanation:

3 (151+101)+(t3)/10=1  3 (1/15+1/10)+(t3)/10=1  3t=24  t=324=8  t=8=8 h

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