$$(2y-1)2=225$$
$y = \frac{227}{4} = 56\frac{3}{4} = 56.75$
$$2y-1=\frac{225}{2}$$
$$2y=\frac{225}{2}+1$$
$$2y=\frac{225}{2}+\frac{2}{2}$$
$$2y=\frac{225+2}{2}$$
$$2y=\frac{227}{2}$$
$$y=\frac{\frac{227}{2}}{2}$$
$$y=\frac{227}{2\times 2}$$
$$y=\frac{227}{4}$$
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