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primary 6 | Maths
| Fractions
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Date Posted: 5 years ago
Views: 3371
But how can Nadia have 450 buttons at first if Nadia and Li Qin have a total of 360 buttons?
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done
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clear
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We must do a backward approach to solve this problem.
Li Qin and Nadia must have had 180 buttons each at the end.
Before that, Li Qin gave away 1/4 of her buttons to reach 180 buttons left. This means that 3/4 of Li Qin's buttons = 180 buttons, so Li Qin had 240 buttons before this give-away while Nadia had 120 buttons.
Before Nadia had 120 buttons and Li Qin had 240 buttons, Nadia had given away 1/5 of her buttons.
This means that 4/5 of Nadia's buttons = 120 buttons, so Nadia had 150 buttons at the start.
Li Qin and Nadia must have had 180 buttons each at the end.
Before that, Li Qin gave away 1/4 of her buttons to reach 180 buttons left. This means that 3/4 of Li Qin's buttons = 180 buttons, so Li Qin had 240 buttons before this give-away while Nadia had 120 buttons.
Before Nadia had 120 buttons and Li Qin had 240 buttons, Nadia had given away 1/5 of her buttons.
This means that 4/5 of Nadia's buttons = 120 buttons, so Nadia had 150 buttons at the start.
Date Posted:
5 years ago
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