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Sagot :
Each student spend 0.625 hours to wash all the cars.
What is unity method?
The unitary method is a strategy for problem-solving that involves first determining the value of a single unit, then multiplying that value to determine the required value.
How much time spent by each student to wash cars?
All the cars are washed by 1 student in 10 hours.
So, the time taken by 4 students to wash all the cars will be 10/4=2.5 hours.
This includes that 4 students wash all the cars in 2.5 hours.
So, the time invested by each student to wash cars is 2.5/4=0.625.
Therefore, each student spend 0.625 hours.
Disclaimer:
It takes one student 10 hours to wash all the cars at a car wash. If 4 students wash all the cars, how many hours will each person spend washing cars? (assume that all students wash cars at the same rate.)
a. 2.5 hrs
b.0.625 hrs
c.5 hrs
d. 0.4 hrs
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