Lim Zhi Yan's answer to Nathan Christopher's Primary 4 Maths Singapore question.

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Lim Zhi Yan
Lim Zhi Yan's answer
3 answers (Tutor Details)
1st
This is the algebraic method, which may not be in your syllabus, but knowing the answer, try to answer this by using the method the school taught you. By the way, the total number of pens is 5A.