the cost of a tea cup is t cents.
the cost of a cup of coffee is (t+5) cents.
the total cost of 7 cups of tea and 11 cups of coffee is 2215 cents.
find the cost of 1 cup of tea.
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Answer:
7t+11(t+5)=2215
7t+11t+55=2215
18t=2215-55
18t=2160
t=2160/18=120
There fore the cost of 1 cup is 120
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