求助俩数学题。。。

surizhang

At a certain restaurant, if each hamburger costs the same amount, what is the cost, excluding sales tax, of 1 hamburger?
(1)The total cost, including a 6 percent sales tax, is $4.77 for 3 hamburgers.



(2)The total cost, including a 6 percent sales tax, is less than $6.50 for 4 hamburgers.



96.10591-!-item-!-187;#058&007292

According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?



(A)25

(B)34

(C)50

(D)67

(E)100




96.10591-!-item-!-187;#058&007292

According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?



(A)25

(B)34

(C)50

(D)67

(E)100



(1)The total cost, including a 6 percent sales tax, is $4.77 for 3 hamburgers.



(2)The total cost, including a 6 percent sales tax, is less than $6.50 for 4 hamburgers.



96.10591-!-item-!-187;#058&007292

According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?



(A)25

(B)34

(C)50

(D)67

(E)100




96.10591-!-item-!-187;#058&007292

According to the directions on a can of frozen orange juice concentrate, 1 can of concentrate is to be mixed with 3 cans of water to make orange juice.How many 12-ounce cans of the concentrate are required to prepare 200 6-ounce servings of orange juice?



(A)25

(B)34

(C)50

(D)67

(E)100

xutongnew

第一题：
设每个hb X刀， 则：
条件一：（1+6%）X＝4.77/3 可得X＝1.5 Sufficient
条件二：4个hb less than, 多少？可以是3，可以是4，可以是5.5
第二题：
200X6＝1200
1200X《1/（1+3）》＝300
300/12＝25
选A

surizhang

第一题：sales tax 不是价格的6%吗？你计算的是成本的6%啊
第二题：1200X《1/（1+3）》＝300  这个没看懂。。可以解释下是什么意思吗

surizhang

第一题：
设每个hb X刀， 则：
条件一：（1+6%）X＝4.77/3 可得X＝1.5 Sufficient
条件二：4个hb less than, 多少？可以是3，可以是4，可以是5.5
第二题：
200X6＝1200
1200X《1/（1+3）》＝300
300/12＝25
选A

-- by 会员 xutongnew (2011/10/30 19:35:24)

xutongnew

呵呵！
好细心的MM！
如果按照你的说法，sales tax 应该是price的6%，cost理解为成本，还应该加上利润才等于price,那就无解了，选E?
但此题按照字面意思理解，应该没有考虑成本、价格差的因素，并且cost也可以做“价格”解释的，你查查字典
第二题，关键是理解题目意思：
1can（罐）  的concentrate配3can的水来做orange juice
问你准备200份6-ounce 的orange juice需要多少12-ounce  can的concentrate
200份6-ounce 的orange juice就是1200ounce
按照1比3配，需要300ounce 的concentrate
每罐是12ounce, 300就是25罐

surizhang

谢谢啊。。第二题我想通了。。我完全忽略了混合起来是4can的那个条件。。囧
哈有第一题。。。我做的时候觉得是E。。实战会有这种很模糊的题吗

xutongnew

个人感觉，题目中如果出现成本、价格、利润等是很明显的，如果像这个第一题，根本就没有提价格、成本的问题。
另外，我看完题目后，第一反应也没有把cost理解成成本。
It is very normal that a salesman tells you that sth costs $XXX when you are in a store .