Hello!
Ok so we have given values of angle 4 and angle 2. Sum of interior angles of a triangle equal 180deg. So if angle 4 is 120deg that makes the measure of angle 3 the supplement angle, equal to 180-120=60deg. So then we have angle 1 equal to 180 - 60 - 35= 85deg. Then from that we can conclude the measure of angle 5 is equal to 95deg.
Hope this helps! Any questions please ask! Thank you!