Sarin and his coin bank part 49 (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, the Math Questions with solutions that teaches in Singapore Primary Schools. You or the kids can learn the skills of dealing with the Math Modeling, the Math problem solving and the 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 Ratio and Problem Solving.

You can read the posting on Sarin and his coin bank for the story of coin bank.

Read the posting on Sarin learns concept of ratio in school to understand Ratio.

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

Upper primary school mathematics question UPQ509

Sarin has 18 coins in his coin bank. He has 6 more coins than Hairu and 12 fewer coins than Fatimah. Find the ratio of the number of Sarin’s coins to the number of Hairu’s coins to the number of Fatimah’s coins.

Solution:

Draw the model,

Per the model,

The number of coins Sarin has = 18

The number of coins Hairu has = 18 – 6 = 12

The number of coins Fatimah has = 18 + 12 = 30

The ratio of the number of coins

Sarin : Hairu : Fatimah = 18 : 12 : 30 = 3 : 2 : 5