数学题求解~

yf62062

data sufficiency
1、the total cost of an office dinner was shared equally by k of the n empolyees who attended the dinner.what was the total cost of the dinner?
(1)each of the k empolyees who shared the cost of the dinner paid $19
(2)if the total cost of the dinner had been shared equally by k+1 of th n empolyees who attended the dinner,each of the k+1 employees would have paid $18
2\form leland's gross pay of p dollars last week ,t percent was deducted for taxes,and then s dollars was deducted for savings,.what amount of leland's gross pay last week remained after these two deductions?
(1)p-s=8000
(2)pt=1600

谢谢撒~~~

schlaf

第一题是c，要结合两个条件吧
（k+1）18=19k
第二题要求的是p-t-s，根据条件，求不出，是e

frankcomputer

第一个是D
都可以

luoweijia0511

1.c 设总数为T.t=KN
条件一 t/k=19  k这里未知 所以不充分
条件二 t/k+1=18 k还是未知 不充分
1+2 可以求出 k和t　所以c

2.e
可以列出p(1-t)-s
条件一 只有P和S的关系 求不出
条件二 只有pt的关系 也求不出  
1+2 也无法求出

yf62062

谢谢撒~~第二题正确答案给的C，我也选的D，应该是答案错了~~嘿嘿~~~再次感谢

yf62062

第一个我也选的D，答案是C，不过上面两个人给的答案有道理，应该是C

yf62062

谢谢谢谢撒~~第二个答案给的是C是不是答案错了呀