27,3:3,5

To simplify 27,3:3,5, we need to perform the division operation.

First, divide 27 by 3: 27 ÷ 3 = 9

Next, divide 9 by 5: 9 ÷ 5 = 1.8

Therefore, 27,3:3,5 simplified is equal to 1.8.