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Help for a question in Mock AMC 8

 
 
huangluke的头像
Help for a question in Mock AMC 8
huangluke 发表于 2017年10月7日 Saturday 17:06
 

Bake Sale

Four friends, Art, Roger, Paul and Trisha, bake cookies, and all cookies have the same thickness. The shapes of the cookies differ, as shown.


How many cookies will be in one batch of Trisha's cookies?

(A) 10(B) 12(C) 16(D) 18(E) 24


 Anybody can help me on this problem? The answer was E. But, I think the given information in this question was insufficient. 

Thanks!

 
ReynosoDavid的头像
Re: Help for a question in Mock AMC 8
ReynosoDavid 发表于 2017年10月10日 Tuesday 12:40
 

You are right, Luke. The problem was missing in the end "Each friend uses the same amount of dough, and Art makes exactly $12$ cookies".