Sarin’s family attend concert at the Esplanade Part 3 (Math Question)

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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).

Upper primary school mathematics question UPQ24

In the concert hall, there were 2/5 as many adults as children. The number of girls was twice the number of boys. If there were 144 more children than adults in the concert hall, how many boys were in the concert hall? 

Solution: 

       Math model

Per the above model,

              1 unit = 144 ÷ 3 = 48

              Adult in the concert hall were 2 × 48 = 96

              Children in the concert hall were 5 × 48 = 240

              The number of girls was twice the number of boys,

      Math Model

Per the model,

              1 unit = 240 ÷ 3 = 80

              Number of boys in the concert hall is 1 unit = 80

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