24 Hours in one Day
5 Days
24 <span>× 5 = 120 Hours
Hope that helps! </span>
The correct answer is 16/81. Hope this helps.
You can use the trigonometric identity

.

The requirement that

eliminates -1/6 from being another solution.
The opposite angles of a quadrilateral are supplementary so you can set them equal to 180.
If there was more information given then i could find the exact values.
Hope this helps :)