Question

A window washer clean 38 windows in 2 hours at this rate how many windows did he clean in 7 hours?

Answer 1

Ok you wash 38 in 2 hours
now multiply 38 by 3 and that's the total you wash in 6 hours
( the 3 is the amount of 2 hour shifts total)
finally divide 38 by 2 and then add that to the total you wash in 6 hours

Answer 2

Proportion:
38/2•x/7
cross multiply:
(7)(38)=2x
simplify:
266=2x
divide:
x=133
133 windows