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AKuangs
The answer is 28 because 4+5=9. 63/9=7. 7 times 4 equals 28.
he1pinghand
it said the ratio is 4:5 so that means you have to add 4 and 5

4 + 5 = 9 

so you take 9 and divided by 63 which is 7 then you take 7 and multiply it by 4 and 5

so 28 blue bikes and 35 black bikes

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