Some balls are to be distributed among some boys. If 4 more balls are available, each boy gets 6 balls. If 3 less balls are available, each boy gets 3 balls. How many balls are there?

Let number of balls be x. Therefore, Number of boys = (x+4)/6 = (x-3)/3 => 3x + 12 = 6x – 18 => x = 10

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