Two angles are supplementary if one of them is 30 less than five times the other find the angles

Not sleeping yet, Ok do some math.

Two angles are supplementary if the sum adds up to 180°. Let the first angle be A and the second be B

we also know that one of the angles is five times the other,

B = 5A plug this in the first equation to get

The measure of the larger angle is 5A =150°

Two angles are supplementary means two angles add up to 180o.  So angle 1 + angle 2 = 180o

Since we don't know either angle, let's say angle 1  = x

If angle 2 is "five times the measure of the other angle (angle 1)", that means angle 2 = 5x

If we put these last 2 equations back to the first one, we get

                             x = 30o           (measure of angle 1 = x)

Always go back and make sure you answered the questions that's being asked.  The question is "what is the measure of the larger angle".  angle 2 is the larger angle, so

So the measure of the larger angle is 150o  

You can quickly check if these angle measurements makes sense: angle 1 + angle 2 should equal 180o, 30o + 150o = 180o.