Siow Lin Hoe's answer to Priscilla's Primary 6 Maths Fractions Singapore question.

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Siow Lin Hoe
Siow Lin Hoe's answer
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Hope it help.
Because at station B, there are 2/5 of passenger alighted. You may use multiple of 5 for assuming initial number of passenger that board at A.(5 units or 10 units)