Eric Nicholas K's answer to help's Secondary 2 Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
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This gets very difficult to understand and it is probably the hardest type of proportion question you will face in Sec 2, with no numerical value whatsoever for y, x and the proportionality constant k.

Let me know if you need further explanation. I am expecting it since this question is ridiculously difficult to explain on paper.