Answer :
well after the first week is 380 which means that before the first week it was smth more. if we see the other weeks it is 20 less every week so before the first week it was 400
x=400-20n is the answer
and 20weeks
x=400-20n is the answer
and 20weeks
well after the first week is 380 which means that before the first week it was smth more. if we see the other weeks it is 20 less every week so before the first week it was 400
x=400-20n is the answer
and 20weeks