Giup mik với
Ex 1:A one-way bus ticket cost 25 dollars. A two- way bus ticket cost 35 dollars. A cashier collected 560 dollars altogether from the sale of 20 tickets. How many one- way bus tickets were sold?
Ex2: the sum of a,b and c is 14. If 9a+8b+6c=101, what is the value of 2a+b=c?
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