Question 273586
let one angle be x

the compliment will be 90-x

half the compliment = 1/2 * (90-x)

x = 1/2*(90-x)+30

x =1/2 *90 - 1/2 *x +30

x =45 -1/2 *x +30

3x/2 = 75

3x = 150
x=50