Two sides of a triangle have lengths x and y and meet at a right angle. If the perimeter of the triangle is 4x, what is the ratio of x to y ?
a) 2 : 3
b) 3 : 4
c) 4 : 3
d) 3 : 2
e) 2 : 1
a) 2 : 3
b) 3 : 4
c) 4 : 3
d) 3 : 2
e) 2 : 1