a factory wanted to produce 7600 radios. at first, they planned to produce 600 radios a day. however, 8 days later, the remaining radios had to be produced in 4 days. how many more radios than originally planned had to be produced everyday?
8*600 = 4800 radios produced.
That leaves 2800 more to be done in 4 days.
I think probably you can take it from there.