Question

the ratio of the complement and supplement of an angle is 2:5. find the angles

Answer 1

to find complement angle
$2x + 5x = 90 \\7x = 90 \\ x = 90 \div 7 \\ x = 12.8 \\ 2x = 25.6 \\ 5x = 64$
to find supplement angle
$2x + 5x = 180 \\ 7x = 180 \\ x = 25.7 \\ 2x = 51.4 \\ 5x = 128.5$