First, divide 10 (amount of juice bottles) by 4 (amount of kids at red table) The answer should be 2.5, meaning each kid at the red table got 2 and a 1/2 bottles of juice.
next, multiply 6 (the amount of kids at the blue table) by 2.5 ( the amount of juice every kid should get). The answer should be 15.
So, there should be 15 bottles of juice given to the blue table.