I think you will find the answer in m a t h w a y
halo edwin perkenalkan saya elto saya minta maaf atas kejadian ini disini ada edam yang warna merah era yang orange itu ekut yang ceria ya eria....
hahay
Well, looks like your out of luck cause we are not your teacher and most likely we are not your classmates, but hope you don't fail bud
Let same number of hours = x,
since the salary earned is also the same, then
Salary of supervisor A = $25x
Salary of supervisor B = $20(30)+$30(x-30)
Equating
25x=600+30(x-30)
30x-25x=900-600
5x=300
x=60 hours
Check:
Salary of supervisor A = 25*60=1500
Salary of supervisor B = 20*30+30*(60-30)=600+900=1500, ok.
