SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。下面我们就一起来看一下2015年3年29日SAT官方每日一题吧。
Read the following SAT test question and then click on a button to select your answer.
Machine X , working at a constant rate, can produce x bolts per hour. Machine Y , working at a constant rate, can produce x+6 bolts per hour. In terms of x , how many bolts can both machines working together at their respective rates produce in 4 hours?
(A) 4x+12
(B) 4x+24
(C) 6x+30
(D) 8x+24
(E) 8x+36
The correct answer is D
Explanation
Machine X , working at a constant rate, can produce x bolts per hour, and machine Y , working at a constant rate, can produce x+6 bolts per hour. Therefore, in one hour, both machines working together at their respective rates can produce x+x+6=2x+6 bolts. It follows that in 4 hours, both machines working together at their respective rates can produce 4(2x +6)=8x+24 bolts.
以上就是关于2015年3月29日SAT官方每日一题中数学选择的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。
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