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Upper primary school mathematics question UPQ123

In The Esplande library, the ratio of the number of boys to the number of girls was 5:3. After 6 boys left, there were 12 more boys than girls. How many boys were there at first?

Solution:

Draw a math model based on the ratio,

From the model,

2 units = 18

1 unit = 9

Boys = 5 × 9 = 45 in the library at first

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