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Sergio paid $12 as entry fee and bought 20 ride tickets, at a price P. He spends a total of $42. We can write this as:
[tex]12+20P=42[/tex]We do not need the information about Julie to calculate P, as we can work this out from the previous equation:
[tex]\begin{gathered} 12+20P=42 \\ 20P=42-12 \\ P=\frac{30}{20} \\ P=1.5 \end{gathered}[/tex]The price of a ride ticket is $1.50.
Julie pay the same entry fee and bougth 25 ride tickets, so she spent $49.50:
[tex]12+25P=12+25\cdot1.5=12+37.5=49.5[/tex]