sstrike's answer to Athan Darren Koh's Primary 6 Maths Ratio Singapore question.
The museum tickets are priced at $10 and $5. The number of $10-dollar tickets available is 2 8/9 that of the number of $5-dollar tickets. 2 out of 3 of the $10-dollar tickets and all the $5-dollar tickets were sold. The ticket sales amounted to $8515. How much more would have been collected if all the tickets were sold?
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