Lee Wei Hern's answer to Shirley Goh's Primary 5 Maths question.
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Original ratio of long:short is 9:2
However since after cutting 1.65m from the longer string, long string is now 3x longer than short string.
So the new ratio is now 6:2.
Hence comparing the two ratios, 1.65m is 9-6 = 3 units.
3 units = 1.65m
1 unit = 0.55m
2 units = 1.10m
Hence, since short string is 2 units, hence it is 1.10m
However since after cutting 1.65m from the longer string, long string is now 3x longer than short string.
So the new ratio is now 6:2.
Hence comparing the two ratios, 1.65m is 9-6 = 3 units.
3 units = 1.65m
1 unit = 0.55m
2 units = 1.10m
Hence, since short string is 2 units, hence it is 1.10m
Date Posted:
6 years ago
Thanks for your help. I understand
Thanks
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