XDF-ps几道题求解？

lilyxiang910

question 83:

Which of the following integers does not have a divisor greater than 1 that is the square of an integer?

A.75      B.42     C.32      D.25     E.12

the answer is:B

谁能告诉我这道题到底是什么意思呢，怎么读都没读懂？

question 53:

after paying a 10 percent  tax on all income over $3,000,a person had a net income of $12,000. what was the income before tax.

A $13,300        B $13,000       C $12,900     D $10,000    E $9,000

the answer is B

我是这样做的：x-(x-3000)*10%=12,000，这样算出来怎么都不是第二个答案，那到底应该怎样算呢

question118:

the figure above represents a system of roads along, which traffic flows in the direction indicated by arrows. if the traffic were to split evenly at each fork of the road system ,what the percent of  the traffic entering fork C would exist at Y?

A 87.5%   B 75%    C 62.5%    D 50%   E 12.5%

这道题本来是有图的，但是传不上来，我想请问一下这道题到底应该怎么解呢？

期待大家帮我解答一下！谢谢！

cannygirl

question 53:

after paying a 10 percent  tax on all income over $3,000,a person had a net income of $12,000. what was the income before tax.

A $13,300        B $13,000       C $12,900     D $10,000    E $9,000

the answer is B

我是这样做的：x-(x-3000)*10%=12,000，这样算出来怎么都不是第二个答案，那到底应该怎样算呢

再算算，是13000阿