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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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