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10 December, 14:00

In a school gym, the ratio of the number of boys to girls was 4:3. After 160 boys left the gym, the ratio become 4:5. How many girls were there in the gym

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  1. 10 December, 14:28
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    Girls never change number

    make same

    4:3 times 5 is 20:15

    4:5 times 3=12:15

    boys:girls

    from 20:15 to 12:15

    boys dropped 160

    20-12=8

    160=8 units

    divide both sides by 8

    20=1unit

    girls=15 units

    20*15=300

    300 girls
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