problem with math

Question

There are white, blue, and red boats in a marina. Two-thirds of the boats in the marina are white, 4

7

 of the remaining boats are blue, and the rest are red. If there are 15 red boats, how many boats are in the marina?



Answer 1

b=47

r=15

w = (2/3)(47+15+w)

3w = 2(62+w) = 2w + 124

w = 124 white boats

186 total boats = r+b+w = 15+47+124