RicoGonza

17.07.2019 • 

Mathematics

It takes a printer 2 1/2 min to print 24 black-and-white pages and 4 color pages. it takes the same printer 3 1/4 min to print 30 black-and-white pages and 6 color pages. let b represent the time in minutes needed to print a black-and-white page and c represent the time in minutes needed to print a color page.the shown system represents the given problem. 24b+4c=2 1/2 30b+6c=31/4 solve the system to complete the statement. it takes the printer min to print a black–and–white page and min to print a color page.

Ответ:

faithabossard

13.03.2022

Mathematics

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Multiply the first equation by 1.5, to get:


Subtract the second equation from this:


Substituting into the first equation:





Therefore, it takes 1/12 minute to print a black-and-white page, and 1/8 minute to print a colored page.

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Ответ:

exiZT7535

25.03.2023

Mathematics

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Her conclusion that 90% of the student body wants the colors changed is an INCORRECT conclusion. The 90% out of 100% is not referring to the total numbers of the student body.For example, 100 people are members of student body if only 50 members responded the survey, then we have:
 90% of 50 members who answered the survey said that they want the changed. 

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