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

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

Proportion:

38/2•x/7

cross multiply:

(7) (38) = 2x

simplify:

266=2x

divide:

x=133

133 windows