Question

the sum of three angles of a qualidetral is 5 times the fourth angle. find the fourth angle.

Answer 1

let the fourth angle be x.
then the sum of other three angles=5x
Sum of all angles of a quadrilateral is 360°.
ATQ
x+5x=360
6x=360
x=360/6=60°

Then the fourth angle is 60°

Answer 2

Here is your answer

Let the fourth angle is X

Sum of the three angles are 5X

SUM OF ALL ANGLE OF A QUALIDETRAL IS 360
$x + 5x = 360 \\ 6x = 360 \\ x = \frac{360}{6} \\ x = 60$
Hence fourth angle is 60

Hope it helps you