GWD-9 三道数学求助~~~非常不解啊！！

dolorez

Q13    答案怎么选C？？我觉得是B啊！！！
If the average (arithmetic mean) of the assessed values
of x houses is $212,000 and the average of the assessed
values of y other houses is $194,000, what is the average
of the assessed values of the x+y houses?

(1)    x+y=36
(2)    x=2y

Q23.      为什么答案是C啊。。我觉得是E啊
At a fruit stand yesterday, the price of each apple was $0.10 more than the price of each orange. What was the total revenue from the sale of oranges at the fruit stand yesterday?
(1) The number of oranges sold at the fruit stand
  yesterday was 5 more than the number of
  apples.
(2) The total revenue from the sale of apples
  at the fruit stand yesterday was $15.00
Q32.   怎么会是B呢？？？、
Last year in a group of 30 businesses, 21 reported a net profit and
15 had investments in foreign markets. How many of the businesses
did not report a net profit nor invest in foreign markets last year?
(1) last year 12 of the 30 businesses
  reported a net profit and had invest-
  ments in foreign markets.
(2) last year 24 of the 30 businesses
  reported a net profit or invested in
foreign markets, or both.

dolorez

帮帮忙啊，拜托啦

tonyweng

1.B 2.E 3.D

Naiveer

我做出来也是
1.b
2.e
3.d