1) If n and y are positive integars and 450y= n^3, which of the following must be an integar?
a) Y/3x2^2X5 ( That is the answer)
b) Y/3^2X2X5
C) Y/3x2x5^2
2) The perimeter of square region S and rectangular region R are equal. If the sides of R are in the ratio 2:3, what is the area of region R to the area of region S?
A) 25:16
B) 24:25
C) 5:6
D) 4:5
E) 4:9
3) The number of stamps that Kaye and Alberto had were in the ratio of 5:3, respectively. After Kaye gave Alberto 10 of her stamps, the ratio of the number Kaye had to the number Alberto had was 7:5. As a result of this gift, Kaye had how many more stamps than Alberto?
a) 20
b) 30
C) 40
d) 60
e) 90
4) A certain company has 18 equally qualified applicants for 4 open positions. How many different groups of 4 applicants can be chosen by the company to fill the positions if the order of selection does not matter?
a) 18
b) 72
c) 180
d) 1,260
e) 3060
I was able to solve this one but looking for a quick way than what I spent on this question.
I am writing in four weeks. Advice will be helpful. All I need is 600.
Thanks
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