Question 307
complementary angles are the angles which have sun equal to 90
Let two angles be x and y
so x+y=90  ----->(1)
given that difference of the two numbers is 58
that means x-y=58  ----->(2)
from equation (2) x=58+y
now putting the value of x in equation in (1)
58+y+y=90
58+2y=90
2y=90-58
y=16
now plug the value of x in either of the two equation  
we get x=74
Therefore two angles are x=74 and y=16