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primary 6 | Maths
| Ratio
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Date Posted: 3 years ago
Views: 355
At 1st
Charles : David : Different
C:D:D
1:3:2
After 6 years
2:5:3
Ratio with difference remain same.
At 1st all ×3
C:D:D
3:9:6
After 6 years all ×2
4:10:6
(The difference before and after are same now = 6
Before Charles = 3
After 6 years
Charles = 4
Therefore,
4u-3u= 6 years.
1u = 6 years.
Charles now = 3u = 3×6 = 18 years old.
Charles : David : Different
C:D:D
1:3:2
After 6 years
2:5:3
Ratio with difference remain same.
At 1st all ×3
C:D:D
3:9:6
After 6 years all ×2
4:10:6
(The difference before and after are same now = 6
Before Charles = 3
After 6 years
Charles = 4
Therefore,
4u-3u= 6 years.
1u = 6 years.
Charles now = 3u = 3×6 = 18 years old.
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