See Soh's answer to MS's Primary 5 Maths Rate & Ratio Singapore question

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Hope this help

Date Posted: 5 years ago

5 years ago

Thanks. It’s clear.
I’m horrid at ratio, so may ask how do you derived at 1u = 6?
1u is 1 unit of ?

Soh

5 years ago

The 1u is 6 years after. There is some method on ratio where you can learnt from the web.