13 tickets

A short and long sightseeing tour is possible at the castle. Ticket for a short sightseeing circuit costs CZK 60, for a long touring circuit costs CZK 100. So far, 13 tickets have been sold for 1140 CZK. How much did you pay for tickets for a short tour?

Correct answer:

a =  240
b =  900

Step-by-step explanation:

a+b = 1140
a/60 + b/100 = 13

a+b = 1140
5a+3b = 3900

a = 240
b = 900

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