Wong Shi Ying's answer to Chng's Primary 5 Maths Rate & Ratio question.
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Use models to help you. Since Abigail’s buttons remains unchanged, break each units into 2 units, so you will still get 8 units . And Hannah increases from her initial 2 units to 7 units, thus 65 is equivalent to 5 units.
Date Posted:
6 years ago