<PRE><B>Question 819473</B>
3a + 5c = 40
a + 5c = 25
a = 25 - 5c
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3a + 5c = 40
3(25 - 5c) + 5c = 40
75 - 15c + 5c = 40
10c = 35
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c = 3.50
a = 7.50
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