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20-09-2020
Mathematics

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how to do this question plz

how to do this question plz class=

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jay40891 jay40891

20-09-2020

Answer:

Adult Ticket: £7

Child Ticket: £2

Step-by-step explanation:

Let the cost of 1 child ticket be c, adult ticket be a.

[tex]2a + 3c = 20 \\ \\ a + 4c = 15 \\ a = 15 - 4c \\ \\ 2(15 - 4c) + 3c = 2 0 \\ 5c = 10 \\ c = 2 \\ \\ a = 15 - 4(2) \\ a = 7[/tex]

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