The ratio of the number of girls to boys in Hall A is 7 : 3. The ratio of the number of girls to boys in Hall B is 2 : 7. The total number of pupils in Hall A is 23\frac{2}{3} of the total number of pupils in Hall B.

  1. (a)

    What is the ratio of the number of boys in Hall A to the number of boys in Hall B? Express your answer in the simplest form.

  2. (b)

    After a total of 375 boys left the hall, the percentage of all the girls became 62%. How many boys remained in the hall?

Ratio and proportionExpress as percentageMixed operations with integers中文
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