I bought = 3 tickets for $48 for Friday
So, 48/3 = $16/ticket
My friend bought = 2 tickets for $36 for Saturday
So, 36/2 = $18/per ticket
My brother collected $96 to buy 6 tickets.
So, 96/6 = $16/ticket
They can go to concert on Friday as on Friday ticket is $16 as my brother collected $96 from 6 people = $16 per person.
Yes, they buy the less expensive ticket, as for Saturday ticket price is $18 and they bought ticket for Friday which is priced at $16.