Alejandro has 3 times as many playlists as Derrick does. Alejandro has 24 playlists. If d = the number of playlists Derrick has,
2 answers:
Answer:
Derrick has 8 playlists in his possession.
Step-by-step explanation:
If Derrick as x amount of playlists, then if Alejandro has 3 times as many playlists as Derrick then he has 3x. Now if Alejandro has 24 playlists we can create the following mathematical expression to figure out how many playlists Derrick has.
.... divide both sides by 3
We can now see that Derrick has 8 playlists.
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First case:
average of test score =70
number of students =p
total score of 'p' students = ( average of test score)*( number of students)
total score of 'p' students =70p
Second case:
average of test score =92
number of students =n
total score of 'n' students = ( average of test score)*( number of students)
total score of 'n' students =92n
total number of students = p+n
total average score =86
so, total score =86(p+n)
total score = total score of 'p' students +total score of 'n' students
now, we can simplify it
now, we can find p/n
................Answer