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45 people are travelling in a bus from location A to location B.
The ticket for a senior citizen who is 60 years of age or older is priced at $6.
The cost of a normal ticket is $9.
The total collection from the senior citizens who are aged 60 years or older is $135 more than the collection from the other passengers.
How many senior citizens aged 60 years or older were travelling in the bus?