2/2:3/6

To simplify the ratio \( \frac{2}{2} : \frac{3}{6} \), we first simplify each fraction:

1. \( \frac{2}{2} = 1 \)
2. \( \frac{3}{6} = \frac{1}{2} \)

Now the ratio becomes:

\[ 1 : \frac{1}{2} \]

To express this ratio in a more standard form, multiply both parts of the ratio by 2 (the denominator of the second part):

\[ 1 \times 2 : \frac{1}{2} \times 2 = 2 : 1 \]

Thus, the simplified ratio is:

2 : 1