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

You can read the posting on **Sarin’s family and Ramadan** in Welcome page about story of Sarin’s family during Ramadan.

To read also the posting on **Sarin learns concept of ratio in school** to understand the concept of Ratio.

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

**Upper primary school mathematics question UPQ523**

Sarin’s mother bought 3 boxes of cookies for comsuming during Ramadan. Each box of cookies contained strawberry cookies and chocolate cookies. The ratio of the number of strawberry cookies to the total number of cookies was 3 : 8. There were 38 more chocolate cookies than strawberry cookies in each box? How many cookies did Sarin’s mother buy?

Solution:

The ratio of cookies in a box,

Strawberry cookies : Total = 3 : 8

Strawberry cookies : Chocolate cookies : Total = 3 : 5 : 8

The model,

As Sarin’s mother bought 3 boxes of cookies and the ratio would remain same irregardless of number of boxes.

The tatol difference in strawberry cookies and Chocolate cookies = 38 × 3 = 114

From the model,

2 units = 38 × 3

1 unit = 57

The total number of cookies bought = 8 × 57 = 456

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