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primary 6 | Maths
| Ratio
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Pls help to explain why the answer is 450. I can't get the answer
Date Posted: 3 years ago
Views: 565
Canteen = 600
Girls = 600 x 40% = 240
Boys = 600-240 = 360
Hall = 1000 - 600 = 400
Girls = 400 x 60% = 240
Boys = 400 - 240 = 160
In school
Total Girls = 240 + 240 = 480
Total Boys = 360 + 160 = 520
After
Canteen
Girls = 30%
Boys = 70%
Hall
Girls = 480 - 30%C --> 70%H=>7
Boys = 520 - 70% C -->30%H=>3
Girl : 480 - 30% C 7
------------------------ = ---
Boys: 520 - 70%C 3
1440 - 90%C = 3640- 490%C
400%C = 2200
1% C = 5.5
Students at Canteen after movement
Girls = 30%
Boys = 70%
Total = 100% = 100 x 5.5 = 550
Thus,
Students at Hall = 1000 - 550 = 450
Girls = 600 x 40% = 240
Boys = 600-240 = 360
Hall = 1000 - 600 = 400
Girls = 400 x 60% = 240
Boys = 400 - 240 = 160
In school
Total Girls = 240 + 240 = 480
Total Boys = 360 + 160 = 520
After
Canteen
Girls = 30%
Boys = 70%
Hall
Girls = 480 - 30%C --> 70%H=>7
Boys = 520 - 70% C -->30%H=>3
Girl : 480 - 30% C 7
------------------------ = ---
Boys: 520 - 70%C 3
1440 - 90%C = 3640- 490%C
400%C = 2200
1% C = 5.5
Students at Canteen after movement
Girls = 30%
Boys = 70%
Total = 100% = 100 x 5.5 = 550
Thus,
Students at Hall = 1000 - 550 = 450
See 1 Answer
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Hope this helps
Date Posted:
3 years ago
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