[問題]Data sufficiency

[axpcliff]

小弟的Math需要好好修理....
1. When three dice were rolled, the sum of the three numbers that came up was 10. Among these three dice, was the greatest number that cam up larger than 5?
(1) The sum of two of the numbers that came up was equal to the third number that came up
(2)the middle number that came up was 3

Ans: A

2.If four children inherited a total of $1,000, how much money did the oldest child inherit?
(1)the oldest child inherited an amount of money that is $200 greater than that of each of the other three children
(2)The other three children together inherited an amount of money that is equal to that of the oldest child
Ans:D

3. If the sum of pan q equals the sum of s and t, is the value of p equal to 5?
(1)p+s=7 (2)t-q=3
Ans: C

[homaru]

小弟的Math需要好好修理....
1. When three dice were rolled, the sum of the three numbers that came up was 10. Among these three dice, was the greatest number that cam up larger than 5?
(1) The sum of two of the numbers that came up was equal to the third number that came up
(2)the middle number that came up was 3

Ans: A

知道三顆骰子數字和=10
1)其中兩顆和=第三顆-->兩顆和=5=第三顆(數字最大的)-->充分
2)中數為3,有可能(1,3,6)(2,3,5)(3,3,4),最大數字大於小於等於5的都有-->不充分

[homaru]

2.If four children inherited a total of $1,000, how much money did the oldest child inherit?
(1)the oldest child inherited an amount of money that is $200 greater than that of each of the other three children
(2)The other three children together inherited an amount of money that is equal to that of the oldest child
Ans:D

設最年長的小孩拿$x
1)(1000-x)/3=x-200
1000-x=3x-600
x=400
2)x=1000/2=500
兩條件都能求出x

[hao]

有三個骰子 骰出來的總合為10
條件一 其中兩個骰子的總合=第三個骰子
可知最大數就是第三個骰子=5 滿足!!

條件二 我舉兩個例子 3,3,5 1,3,6 故不滿足

[homaru]

3. If the sum of pan q equals the sum of s and t, is the value of p equal to 5?
(1)p+s=7 (2)t-q=3
Ans: C

題目:q=s+t,問p=5?
1)p+s=7...(s不知)
2)t-q=3, 又t-q=-s-->s=-3代入(1)
-->p-3=7-->p=7+3=10

更正,原來題目是問sum of p and q,不是問sum of pan q...
那看樓下agk大哥解法就ok了

[agk99]

大哥
第一題的題幹看一遍我也不知在幹嘛，但你看條件一，己經講答案了，兩數和等於第三數，就是A啦。第二個條件的結果，另兩個數的組合有(3,4)(2,5)(1,6)，(可以重復)，所以就是A

第二題，這一題我想你的問題是不是條件一與條件二的答案不相同，而產生疑惑，但我以前也遇過類似情況，記得ETS是允許這種情況發生的，所以這一題我會選D，既使有點不同

第三題，就大膽的算進去，p+q=s+t 兩邊都+s
p+q+s=s+s+t=7+q=2s+t 兩邊再一起減q
7=2s+3 s=2 再套條件一，p=5
所以結論，合併兩條件，選C

[agk99]

大夥真熱情
十四分鐘解了五個人次