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primary 5 | Maths
| Rate & Ratio
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Date Posted: 5 years ago
Views: 259
With a change in 16 books, the average changes by 2.
There must have been 16/2 = 8 people altogether, so there are 7 friends.
There must have been 16/2 = 8 people altogether, so there are 7 friends.
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