Sarin’s family in Kluang part 9 (Math Question)

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The blog postings are about the Singapore Math. The readers can learn from the postings about Solving Singapore Primary School Mathematics. The blog presenting the Math Concept, Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills of dealing with Math Modeling, Problem Sum from Lower Primary School to Upper Primary School level after reading the blog postings. This posting is an upper primary school math question on Problem Sum.

Read the posting on Sarin’s family in Kluang about Sarin’s family venture in Kluang.

Challenge yourself with the question before look out for the given solution‼!

Upper primary school mathematics question UPQ356

Sarin visited the Popular Book Co. in Kluang mall during his family in Kluang. He bought 6 magazines and 3 books for $63. A magazine cost $3 less than a book. Find the cost of a magazine.

Solution:

            The cost comparision on one magazine and one book as below diagram shown.

UPQ356-1

 

 

            The total cost model

UPQ356-2

 

 

            From the model

            9 units = 63 – 9 = 54

            1 unit = $6

            The cost of a magazine is $6

Alternative solution:

            By solving equation

            Set M as a magazine cost and B as a book cost

                        M = B – 3

                        6M + 3B = 63

            Solve the above two equations

                        6B – 18 + 3B = 63

                        9B = 81

                        1B = $9

                        The cost of a book = $9

                        The cost of a magazine = 9 – 3 = $6

More Questions on Problem Sum. Click here….

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