[問題] GWD -9-Q12

[clare]

Q12

At a sale all books were priced equally and all magazines were priced equally.
What was the price of 3 books and 4 magazines at the sale?

(1) At the sale the price of a book was $1.45 more than the price of a magazine.
(2) At the sale the price of 6 books and 8 magazines was $43.70.

answer is B.
這題應該(1)+(2)才充分吧? 選C,
the unit price of books is $3.95 and the unit price of magazines is $2.5.
難道(2)要硬湊嗎? 又不是計算機!!

有人有別的想法嗎?

[coulomb]

原題問3B+4M等於多少
條件一不充分
條件二告訴你: 6B+8M=43.7
將這條式子除以2就可以得到答案
所以B充分

這題是因為剛好有比例關係才可以這樣做
不是每一題都可以用看的看出答案
請指教∼