samsmith666
21.11.2019 •
Mathematics
Only 2/5 of the students doubted. if 600 students were no doubters, how many students were there in all?
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Ответ:
1000 students
Step-by-step explanation:
First, what fraction is left of 2/5? 3/5!! Now you can set up a proportion. 3/5 is equal to 600/??? Simple. 5 * 600 = 3000. 3000 / 3 = 1000. That's the total number of students, your answer!
For further understanding:
This means that 400 students doubt. 400/1000 and 2/5 both equal 0.4, so that is a clue to know you are right.
Ответ:
Ответ:
Step-by-step explanation:
The cost of computer = $ 800
It losed 1/4th of value every year.
The value of computer after 0 years = cost of computer = $ 800
The value after 1 year = 800 - (
) = $600
The value after 2 years = 600 - (
) = $450
The value after 3 years = 450 - (
) = $337.5
The value after n years = computer cost at (n-1) year -