# Sarin’s family attend concert at the Esplanade Part 17 (Math Question)

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

The story on Sarin’s family attend concert at the Esplanade you can read postings on Sarin’s family attend concert at the Esplanade in Welcome category and Sarin’s family attend concert at the Esplanade Part 2 (Math Question).

You should click and read the posting on Sarin learns the concept of Fraction (mathematics concept) to understand Portion or Fraction.

Upper primary school mathematics question UPQ239

There were 120 pupils in the Esplanade library. 3/5 of them were girls. Some girls then left the library. The number of girls remaining was 4/7 of the remaining pupils. How many girls left the library?

Solution:

Initially,

3/5 of the 120 pupils were Girls

From the model,

5 units = 120

1 unit = 24

The number of Girls = 3 × 24 = 72

The number of Boys = 2 × 24 = 48

Finally,

The number of girls remaining was 4/7 of the remaining pupils

Only some girls left and all the boys remain in the Esplanade library

From the final model

3 units = 48

1 unit = 16

The number of Girls remain in Esplanade library = 4 × 16 = 64

The number of Girls left the Esplanade library = 72 – 64 = 8