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OpenStudy (anonymous):
2205 = 315a +210c 9 = a + c
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OpenStudy (anonymous):
so cost = a(315) + c(210) a is the number of adults, c is the number of children and we know there was 9 of them so a + c = 9 giving you the system 2205 = 315a +210c 9 = a + c solve one of these for a. Then replace this value of a into the other equation to find c
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