July-9- GRE - Quants - Question

Quant:

1.Col A: 3^(-8 ) – 3^(-9) – 3^(-9)
Col B: 3^(-9)


2. If sum of 5 tests score is 120 and at least two of them are less than 20.
Col A: Average of 5 tests
Col B: Median of five tests


3. Given that an = a(n-1) + 3 and a1 = 3.
Col A: a100
Col B: 300
(Here n, n-1, 1, 100 are suffixes)


4.If 20 < 4X < 28 and 8 < x+4 < 11
Col A: x
Col B: 5


5.Col A: 10%(sqrt(573.28 ))
Col B: sqrt(57.328 )


6.

What is the degree of arc ABC?


7.

What is the ratio of Inner Square to the area of outer square if the diameter of the circle is ‘r’?


8. l-7l + l3l – l-10l =?


9.Given x is an integer such that 7x+4 < 8
Col A: x
Col B: 1


10. If m, n, p are prime numbers greater than 10, find the number of factors of m, n, p including mnp and 1.


11. Given total number of students as 120 &
Number of students learning Spanish = 40
Number of students learning French = 60
Number of students learning Russian = 80
Number of students learning 2 languages = 50
Number of students learning all 3 languages = 10
Find number of students learning none of these languages?


12. Given -1 < r < t < 0
Col A: r+rt^2
Col B: -1


13. Given stock price at end of June is x, stock price increase in July is 10% and increase in august is again 10%. If September price = 70% of august price then
Col A: September price
Col B: 0.9x

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krazzycool



Joined: 10 Jul 2008
Posts: 5
Posted: Fri Jul 11, 2008 2:37 pm Post subject:

1. C
2. D
3. C
4. D
5. B
6. If they askin for angle ABC , then ans is 40 deg
7. 1/8
8. 0
9. B
10. i feel they askin for factors of mnp includin m , n , p and 1 ..
in tat case the no of factores is 4
11. the total no of students cannot be equal to 120 .. it has 2 be atleast 130..
12. A
13. A[/b]

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harish



Joined: 10 Jul 2008
Posts: 3
Posted: Fri Jul 11, 2008 3:05 pm Post subject: answers as per my knowledge...if any mistakes plzz correct..

1.c
2.d
3.c
4.d
5.b
6...i hav doubt so,cant solve it
7.1/2
8.0
9.b
10.i think the answr is 2..bcoz evry prime num has only two factors 1 and itself..but i dint understand ""including mnp""wat does it mean?
11.d
12.is it rt^2 or (rt)^2....anyhow the answer is A
13.b...






if any mistakes plzz dont hesitate to reply me.....bye.

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soton2000



Joined: 11 Jul 2008
Posts: 7
Posted: Fri Jul 11, 2008 7:54 pm Post subject:

4.A

10.8
11.110
12.D
13.B

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vikee



Joined: 07 May 2008
Posts: 4
Posted: Sat Jul 12, 2008 11:45 am Post subject:

.If 20 < 4X < 28 and 8 < x+4 < 11
Col A: x
Col B: 5

ans is A: x>5 & x<7 put value in it
if 5.1 20<20.4<28 ,,,,, 8<5.1+4<11
if u think it 's wrong & D plz explain me
reply soon. my gre date is 15 july
_________________
vikee patel

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diabloroxx



Joined: 19 Jun 2008
Posts: 7
Posted: Sun Jul 13, 2008 10:42 am Post subject:

Hey can someone help me in solving the 11th problem.Please guide me in solving such types of problems.

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ayush.bits



Joined: 08 Jul 2008
Posts: 12
Location: BITS, Pilani Posted: Mon Jul 14, 2008 1:53 pm Post subject:

4. taking intersection of two cases we will get x lies from (5,7) both excluded. Hence Ans is A.

6. Since AC and BC are radius of the circle both the sides are equal. It is an isosceles triangle with one of the equal angles equal to 50. Therefore the other angle will be 50.

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ayush.bits



Joined: 08 Jul 2008
Posts: 12
Location: BITS, Pilani Posted: Mon Jul 14, 2008 2:06 pm Post subject:

10. If m, n, p are prime numbers greater than 10, find the number of factors of mnp including m,n,p and 1.
I feel this wud be the question.

In that case writing mnp in factorial form we get mnp = m^1*n^1*p^1.
m,n,p are prime factors. It is a property of ne number that if m^a*n^b*p^c are its prime factors than total no. of divisors are given by (a+1)(b+1)(c+1).

Applying this property here we get 2*2*2 = 8 as the answer.

12. r(1+t^2) is the form in which we can write it. 1+t^2 is greater than 1. Take limiting case of t=r=0. In that case column A is 0. A>B

Take limiting case of t=r=-1. In that case column A is -2. Therefore D is the answer.

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ayush.bits



Joined: 08 Jul 2008
Posts: 12
Location: BITS, Pilani Posted: Mon Jul 14, 2008 2:09 pm Post subject:

In q11, as rightly pointed out total no. of students cant be 120.
To solve these type of qs draw a Wenn diagram.

Let the total no. of students be N.

Then no. of students not learning any language wud be:
N-(40+60+80-50+10)

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jegnesh



Joined: 17 Jul 2008
Posts: 1
Posted: Thu Jul 17, 2008 10:35 am Post subject: ans of quant 11

for ques 11 we use the formula==
Total-Neithr=A+B+C-(only two case)-2(all three case)
by putting crrect value we get the ans=10