Tickets sold on Monday + Tuesday + Wednesday + Thursday = 500
Tuesday = 1/2 of Monday = 0.5 Monday
Wednesday = 1/2 of Tuesday = 0.5 Tuesday = 0.25 Monday
Thursday = 80 tickets
So,
Let the tickets sold on Monday be x
Then,
x + 0.5 x + 0.25 x + 80 = 500
1.75 x = 420
x = 240
That means, on Monday, 240 tickets were sold.
Hint: Using the Monday's value, Calculate for all the days
