SOLUTION: Suppose you buy lunch for the math club. You have enough money to buy 20 salads or 15 sandwiches. The group wants 12 sandwiches. How many salads can you buy?

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Question 557999: Suppose you buy lunch for the math club. You have enough money to buy 20 salads or 15 sandwiches. The group wants 12 sandwiches. How many salads can you buy?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let a = cost of a salad
Let b = cost of a sandwich
given:
+20a+=+15b+
-------------
+20a+=+15b+
+a+=+%2815%2F20%29%2Ab+
+a+=+%283%2F4%29%2Ab+
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12 sandwiches would be the same as
+a+=+%283%2F4%29%2A12+
+a+=+9+
You can buy 9 salads