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1. In a school there are 800 students

3/10 of the total number of students are in year 7 and year 8 combined
1/4 of the total number of students are in year 9
The remaining students are in either year 10 or year 11 in Yh ratio 5:4

What percentage of the pupils in the school are in year 11 ? ‪
2. (Original post by fentydrug)
In a school there are 800 students

3/10 of the total number of students are in year 7 and year 8 combined
1/4 of the total number of students are in year 9
The remaining students are in either year 10 or year 11 in Yh ratio 5:4

What percentage of the pupils in the school are in year 11 ? ‪
Number of students in year 7 and 8 = (3/10) * 800

Number of students in year 9 = (1/4) * 800

Number of students in year 10 and 11 = 800 - (number of students in year 7, 8 and 9)

Ratio of year 10 to 11's is 5:4, so 4/9 of the remaining students are in year 11.

You can find the number of students in year 7 and 8, and 9 to find the number of year 10s and 11s.

Percentage of year 11s = (number of people in year 11 *100) / (Number of people in the whole school)
3. (Original post by Loci Pi)
Number of students in year 7 and 8 = (3/10) * 800

Number of students in year 9 = (1/4) * 800

Number of students in year 10 and 11 = 800 - (number of students in year 7, 8 and 9)

Ratio of year 10 to 11's is 5:4, so 4/9 of the remaining students are in year 11.

You can find the number of students in year 7 and 8, and 9 to find the number of year 10s and 11s.
I’m the worst at maths thank you
4. (Original post by fentydrug)
I’m the worst at maths thank you
No problem. Good luck with the question
5. (Original post by Loci Pi)
No problem. Good luck with the question
I got 53.3 recurring as the number of students in year 11?
6. (Original post by fentydrug)
I got 53.3 recurring as the number of students in year 11?
I got 160 as the number of students in year 11.

Number of students in year 7 and 8:
Spoiler:
Show

(3/10) * 800 = 240

Number of students in year 9:
Spoiler:
Show

(1/4) * 800 = 200

Number of year 10s and 11s:
Spoiler:
Show

800 - 240 - 200 = 360

Number of students in year 11
Spoiler:
Show

= (4/9) * 360 = 160

If you post the working out that you did, you can compare them to these stages of working. There will have been a mistake somewhere if you do not get a whole number of students.
7. (Original post by Loci Pi)
I got 160 as the number of students in year 11.

Number of students in year 7 and 8:
Spoiler:
Show

(3/10) * 800 = 240

Number of students in year 9:
Spoiler:
Show

(1/4) * 800 = 200

Number of year 10s and 11s:
Spoiler:
Show

800 - 240 - 200 = 360

Number of students in year 11
Spoiler:
Show

= (4/9) * 360 = 160

If you post the working out that you did, you can compare them to these stages of working. There will have been a mistake somewhere if you do not get a whole number of students.
yes thank you I stupidly added 240 Twice
8. (Original post by fentydrug)
yes thank you I stupidly added 240 Twice
Now you can use that to find the the % of students in year 11.

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