60x+80=100x combine like terms
80=100x-60x or 40x divide to get x by itself
80/40=40x/40
20=x
after 20 hrs
5000 ~ 40 bc because a x and give that
To the nearest what the nearest ten is 360,000 nearest ten thousand 400,000
I am not really sure about this answer, but it is 4308.08in
Hope this helps!