Construction 1639

A group of masons had to finish the rough construction within three days. On the first day, they completed a third of this task, but on the second day, they were delayed and did 15% less work than the first day. By what % relative to the second day must they increase their performance on the third day to complete the building?

Correct answer:

p =  35.29 %

Step-by-step explanation:

1/3 + (1-15/100)·1/3 + (1-15/100)·1/3·(1+p/100)=1

0.85p = 30

p = 30/0.85 = 35.29411765

p = 600/17 ≈ 35.294118

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