Eric's answer to PurpleOlive's Primary 5 Maths Rate & Ratio Singapore question.
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First cut the block into 20 parts instead of 10 because we need to accomodate the ratio of 3:2
3:2 = 9:6. Thus we have 9 parts for the $15 tickets. The balance 5 = (20 -6 -9) units belong to the $30 tickets.
Next find how many tickets is equilavent to 1 part. Use 5u × $30 - 6u × $12 = $390
From here, we get 1 unit = 5 tickets.
The answer is the sum of all the tickets × price of each ticket.
3:2 = 9:6. Thus we have 9 parts for the $15 tickets. The balance 5 = (20 -6 -9) units belong to the $30 tickets.
Next find how many tickets is equilavent to 1 part. Use 5u × $30 - 6u × $12 = $390
From here, we get 1 unit = 5 tickets.
The answer is the sum of all the tickets × price of each ticket.
Date Posted:
4 years ago
Thank you very much for your help.
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