The concert was attended by a total of 480 people on Saturday.
Assume the number of people who attended the concert on Saturday is x.
The total number of people who attended on both days is:
= Friday people + Saturday people
Friday people were 3/4 of the Saturday people:
= x × 3/4
= 3/4x
The number who attended on Saturday is therefore:
Total number = Friday people + Saturday people
x + 3/4 x = 840
x + 0.75x = 840
1.75x = 840
x = 840 / 1.75
= 480 people
In conclusion, 480 people attended on Saturday.
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