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29 December, 07:37

At dan's school, 6 out of every 10 kids know how to swim. If there are 350 kids in his school, how many know how to swim?

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  1. 29 December, 07:43
    0
    If the ratio of kids who know how to swim is 6:10, that means that 60% of the schools population knows how to swim. So you can multiply 350 by 0.60 to get 210 kids.

    You can show why the calculation is true since 6/10 = x/350. We can say the two ratios are equal since 6/10 ratio holds true for every group of 10 that leading up to a total number of 350. (you can have 35 groups of 10 each one having a 6 to 10 ratio. (6/10) x (35/35) = 210/350
  2. 29 December, 07:47
    0
    210 because if you multiply 10 by 35 to get 350 you have to multiply 6 by 35 then you get 210
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