1.Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?
A. 4
B. 6
C. 8
D. 10
E. 12
Answer:
2.For a nonnegative integer n, if the remainder is 1 when 2n is divided by 3, then which of the following must be true?
I. n is greater than zero. II. 3n = (-3)n III. √2n is an integer. A. I only
B. II only C. I and II
D. I and III
E. II and III
I. n is greater than zero.
II. 3n = (-3)n
III. √2n is an integer.
A. I only
B. II only
C. I and II
D. I and III
E. II and III
1.Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?
A. 4
B. 6
C. 8
D. 10
E. 12
Answer:
这个题可以列方程式 两个 然后解联立方程 设x每天生产xw产品 y每天生产yw产品
1-----w/xw-w/yw=2
2-----(5w/4)/(wx+wy)=3 但是我觉得简便方法就是往里面带数 答案e说 是12天 那么 x的生产效率是 每天w/6 产品 y是w/4 你会发现带进去刚刚好 考试的时候 往里面带数好了
2.For a nonnegative integer n, if the remainder is 1 when 2n is divided by 3, then which of the following must be true?
I. n is greater than zero. II. 3n = (-3)n III. √2n is an integer. 这个题 还是带数好了 对于这种必然有结果的题 带数是最方面的 发现 提干成立的时候 n为偶数 所以答案选2和3正确 选e
I. n is greater than zero.
II. 3n = (-3)n
III. √2n is an integer.
这个题 还是带数好了 对于这种必然有结果的题 带数是最方面的
发现 提干成立的时候 n为偶数 所以答案选2和3正确 选e
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