Step-by-step explanation:
Question 7.
Margaret's age=m
Henry's age=m+8
m+m+8=44
2m=44-8
2m=36
m=18
Question8
Henry's age=18+8=26
Question 9
(92+88+95+x)/4>90
275+x>90×4
x>360-275
x>85
