Answer:
133
Step-by-step explanation:
If he cleaned 38 windows in 2 hours then he cleaned:
38 win / 2 hours = 19 windows per hour.
If he goes for 7 hours then he cleans a total of: 19 * 7 = 133 windows in 7 hours.
proportion:
38/2•x/7
cross multiply:
(7)(38)=2x
simplify:
266=2x
divide:
x=133
133 windows
