一道SAT数学题.if 4 bags of flour with an average weight of 15 pounds are put onto a shelf with 45-pound bags of flour,what is the average weight,in pounds,of all 8bags on the shelf?(A)5(B)10(C)15(D)20(E)25答案是10,但我怎么算都不是10..

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一道SAT数学题.if 4 bags of flour with an average weight of 15 pounds are put onto a shelf with 45-pound bags of flour,what is the average weight,in pounds,of all 8bags on the shelf?(A)5(B)10(C)15(D)20(E)25答案是10,但我怎么算都不是10..

一道SAT数学题.if 4 bags of flour with an average weight of 15 pounds are put onto a shelf with 45-pound bags of flour,what is the average weight,in pounds,of all 8bags on the shelf?(A)5(B)10(C)15(D)20(E)25答案是10,但我怎么算都不是10..
一道SAT数学题.
if 4 bags of flour with an average weight of 15 pounds are put onto a shelf with 45-pound bags of flour,what is the average weight,in pounds,of all 8bags on the shelf?
(A)5
(B)10
(C)15
(D)20
(E)25
答案是10,但我怎么算都不是10...不知道是我没看懂题还是.....

一道SAT数学题.if 4 bags of flour with an average weight of 15 pounds are put onto a shelf with 45-pound bags of flour,what is the average weight,in pounds,of all 8bags on the shelf?(A)5(B)10(C)15(D)20(E)25答案是10,但我怎么算都不是10..
题目应该是这样的.
4袋平均15磅的面粉和4袋5磅的面粉,放在一个架子上,8袋在一起的平均质量是多少?(4*15+4*5)/8=10 选B

4袋面粉,平均每袋重15磅,把他们放在一个有着45磅的许多袋面粉的架子上。这8袋面粉的平均重量是多少?用磅表示。
额…………应该是(4*15+45)/8=11.875磅
这个做法应该没问题吧………………
只是这个结果不像是SAT题目的数字。。。
莫非是取最接近的答案?。。。。。我也困惑了。。。...

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4袋面粉,平均每袋重15磅,把他们放在一个有着45磅的许多袋面粉的架子上。这8袋面粉的平均重量是多少?用磅表示。
额…………应该是(4*15+45)/8=11.875磅
这个做法应该没问题吧………………
只是这个结果不像是SAT题目的数字。。。
莫非是取最接近的答案?。。。。。我也困惑了。。。

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你打的题有一个小错,with 45-pound bags of flour 应该是 with 4 5-pound bags of flour。把题翻译出来后,就看出它很简单:“如果一个搁板架上有4袋5磅重的面粉,再放上4袋平均重量为15磅的面粉,那么搁板架上的8袋面粉的平均重量是多少(以磅计)?”解法:(4x5 + 4x15)除以 8 = 10。OK?...

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你打的题有一个小错,with 45-pound bags of flour 应该是 with 4 5-pound bags of flour。把题翻译出来后,就看出它很简单:“如果一个搁板架上有4袋5磅重的面粉,再放上4袋平均重量为15磅的面粉,那么搁板架上的8袋面粉的平均重量是多少(以磅计)?”解法:(4x5 + 4x15)除以 8 = 10。OK?

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