AIME Test Question -How quick can you get the answer?

This is the first question on this year's AIME test. Since it is the first question, it must be easy. As a student, you want to get the answer as quickly as possible in order to conserve time for harder questions.

How long will it take you to answer this question? Explain your thought process.

所有跟帖： 

• My Answer -dr_yin- ♂ (87 bytes) () 10/20/2015 postreply 13:29:17

• 我让我还在小学的小儿子做的，老爸做不出来。他花了大概10秒钟吧。^_^ -寅先生- ♂ (87 bytes) () 10/20/2015 postreply 14:11:26

• Very impressively fast. -dr_yin- ♂ (0 bytes) () 10/20/2015 postreply 14:25:45

• 现在的孩子都很厉害，比大人们可要聪明多了。 -寅先生- ♂ (291 bytes) () 10/20/2015 postreply 15:55:22

• 小学十秒钟做aime？过两年可以IMO了：） -怀旧一点点- ♀ (0 bytes) () 10/20/2015 postreply 15:01:06

• 题目要求是get the answer，包括从网上找到答案。 -寅先生- ♂ (61 bytes) () 10/20/2015 postreply 15:58:22

• You got me! -dr_yin- ♂ (0 bytes) () 10/20/2015 postreply 16:17:48