Johnson Poon's answer to Benny Kang's Primary 5 Maths Whole Numbers question.

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Johnson Poon
Johnson Poon's answer
279 answers (A Helpful Person)
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# means number. Hope this algevra method helps. This qn is only one variable (only x), it'll be trickier if there's another variable for price (then you'll need to do simultaneous equations with x and y variables)