题目信息
A school supply store sells only one kind of desk and one kind of chair, at a uniform cost per desk or per chair. If the total cost of 3 desks and 1 chair is twice that of 1 desk and 3 chairs, then the total cost of 4 desks and 1 chair is how many times that of 1 desk and 4 chairs?
A:5
B:3
C:
D:
E:
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已选答案：
正确答案：
E:
Algebra Simultaneous equations
Let d represent the cost of 1 desk and let c represent the cost of 1 chair. It is given that 3d + c = 2(d + 3c). It follows that d = 5c. Then 4d + c = 21c and d + 4c = 9c. Since
, the total cost of 4 desks and 1 chair is 
times that of 1 desk and 4 chairs.
The correct answer is E.
Let d represent the cost of 1 desk and let c represent the cost of 1 chair. It is given that 3d + c = 2(d + 3c). It follows that d = 5c. Then 4d + c = 21c and d + 4c = 9c. Since
, the total cost of 4 desks and 1 chair is times that of 1 desk and 4 chairs.The correct answer is E.
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