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
1)5873 x 4=23492
2)5000 x 4=20000
3)800 x 4=3200
4)70 x 4=280
5)3 x 4=12
71.83
