Schools are the number of ball and football?

Ball and soccer schools are a total of 100, ball number 1 / 3 to the Number 1 football / more than 10 to 16. Schools are the number of ball and football?

2009 -11-14 14:33 supplementary question

Please provide a detailed point, thank you pull!

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set up soccer ball X number of number of Y

is: X + Y = 100

1/3X - 1 / 10Y = 16

Solution: get X = 60 Y = 40

60 balls, 40 soccer.