It takes 4 time just use a calculatotor and put 500 + 5% = 525
Answer:
23/5
Step-by-step explanation:
9 3/5=48/5
48/5-5
48/5-25/5
23/5
Answer: -10.9
Step-by-step explanation:
-3.6 on both sides to get rid of the 3.6, the x= -10.9
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
![86(p+n)=70p+92n](https://tex.z-dn.net/?f=%2086%28p%2Bn%29%3D70p%2B92n%20)
now, we can simplify it
![86p+86n=70p+92n](https://tex.z-dn.net/?f=%2086p%2B86n%3D70p%2B92n%20)
![86p-70p=92n-86n](https://tex.z-dn.net/?f=%2086p-70p%3D92n-86n%20)
![16p=6n](https://tex.z-dn.net/?f=%2016p%3D6n%20)
now, we can find p/n
![\frac{p}{n}= \frac{6}{16}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bp%7D%7Bn%7D%3D%20%5Cfrac%7B6%7D%7B16%7D%20)
................Answer