Problema Solution
It takes 105 person-hours to set up a new computers in an office. A crew sets up the computers and each person works the same number of hours. It takes 7 hours to complete the job. How many people are on the crew?
Answer provided by our tutors
let 'x' be the number of people on the crew
1 person needs 105 hours to set up the computers - the rate per person is 1/105 (computers in a office) per hour
together they complete the job in 7 hour thus their together rate is 1/7 (computers in a office) per hour
the sum of x individual rate = the together rate
x(1/105) = 1/7
by solving we find
x = 15 people on the crew
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