# RWY

Calculate the opposite direction of the runway 13.

Runways are named by a number between 01 and 36, which is generally one tenth of the azimuth of the runway's heading in degrees: a runway numbered 09 points east (90°), runway 18 is south (180°), runway 27 points west (270°) and runway 36 to the north (360° rather than 0°).

A runway can normally be used in both directions, and is named for each direction separately.

Correct result:

x =  31

#### Solution:

$x = \dfrac{ (130 ^\circ + 180 ^\circ )\mod 360 ^\circ }{10} = \dfrac{ 310 ^\circ \mod 360 ^\circ }{10} \ \\ x = 31$

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