Sarin’s family in Kluang part 13 (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 presents 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.

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

Upper primary school mathematics question UPQ391

In a candy shop at Kluang, Sarin bought 4 times as many candy bars as chocolate bars. The total mass of candy bars and chocolate bars was 1.64
kg. The mass of chocolate bars was 0.84 kg heavier than that of the candy bars. The mass of 1 bar of chocolate bar was 0.228 kg heavier than 1 bar of candy bar. Find the number of chocolate bars that Sarin bought.

Solution:

There are 4 times as many candy bars than chocolate bars

Model in term of Quantities

1 chocolate bars was 0.228kg heavier than 1 candy bar

The total mass different was Chocolate bars was 0.84kg heavier than candy bars

From the model

8 units = 1.64 – 0.84 = 0.8kg

1 unit = 0.1kg

The extra mass of the chocolate bars = 3 × 0.1 + 0.84 = 1.14kg

The number of chocolate bars that Abdul bought = 1.14 ÷ 0.228 = 5