Mason with assistant

Mason had to complete the work in 10 days. Two and a half days later, his assistant arrived. Together they completed the work in the next three and a half days. How many days would he need an assistant for the same work?

Correct answer:

x =  8.75 d

Step-by-step explanation:

x·(2.5+3.5) + 10·3.5 = 10·x

4x = 35

x = 35/4 = 8.75

x = 35/4 = 8.75

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