The given triangle is shown:
Recall the formula for the Tangent Ratio in a right triangle:

Notice from the figure that the length of the leg opposite the angle is given as x and the length of the leg adjacent is 10.
Substitute these values into the tangent ratio with θ=27⁰:

Solve the equation for x:

Evaluate the expression:

The value of x is about 5.10 units.