The proportion of angles of a quadrilateral are in the ratio of 3:5:9:1. Than the value of the 2/3 sum of the smallest and largest angle is-
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let the constant ratio be x then
the angles are 3x 5x 9x and 1x
and the sum of angles of a quadrilateral is 360 degree
3x + 5x + 9x + x = 360 \\ 18x = 360 \\ x = 360 \div 18 = 20 \\
therefore angles are
3x =3×20=60
5x=100
9x=180
x=20
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