2. 外语
  3. A sub sandwich and a soda at a basketball game’s concession stand costs $3.40. A family purchases three sub sandwiches and two s

A sub sandwich and a soda at a basketball game’s concession stand costs $3.40. A family purchases three sub sandwiches and two s

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问题 A sub sandwich and a soda at a basketball game’s concession stand costs $3.40. A family purchases three sub sandwiches and two sodas, and the total cost is $9.What is the cost of a soda?
选项 A、$1.00
B、$1.10
C、$1.15
D、$1.20
E、$1.40
答案B
解析 The correct answer is B. The problem can be solved by using two simultaneous equations: s+d=3A0 and 3s+2d=9.10. Doubling the first equation and subtracting it from the second gives the result that s(the cost of a soda)is $1.10.
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