(A) 2
(B) 3
(C) 4
(D) 6
(E) 9 b
2 In a certain set of weights, for each positive integer n less than 10, there is one weight that weighs 2n grams. What is the least number of such weights with a combined weight of 108 grams?
(A) Three
(B) Four
(C) Five
(D) Six
(E) Seven b
3 If (a -1)(b - 2) = 0, which of the following must be true?
I. a = 1 and b = 2.
II. If a ¹1, then b = 2
III. If a =1, then b ¹ 2 .
(A) I only
(B) II only
(C) III only
(D) I and II
(E) II and III b
4 If (x - 5)( y + 2) = 0 , which of the following must be true?
(A) x = y
(B) x > y
(C) x < y
(D) xy = -10
(A) None of the above e
5 If (-2,k) is a point on the graph of y = 2×2 - 3x +1, then k =
(A) -13
(B) -1
(C) 3
(D) 11
(E) 15 e
6 The product of two positive integers m and n is twice their sum. If n is 6, what is the
value of m ?
(A) 8
(B) 6
(C) 4
(D) 3
(E) 2 d
10 comments:
hey plzzz post the explanations of all the questions in quant2 coz i think answers of many questions r wrong.....
kindly do the favour
6q.M*N=2(M+N)
AND N =6
6M=2(M+6)
4M=12
M=3
4Q.(X-5)(Y+2)=0
SO WE CANT SAY WCH ONE IS GREATER AND CORRECT VALUES
IT DEPENDS UPON X AND Y VALUES
ANS IS CANT SAY
i need the explanation for the 2nd question.. also explain me the question.. i did not get that clearly. plz do me this favour as soon as possible.. my exem is 9days ahead...
i need the explanation for the 2nd question.. also explain me the question.. i did not get that clearly. plz do me this favour as soon as possible.. my exem is 9days ahead...
1q. volume of th cube=54
and h=2l as all sides are equal
in cube area=l*b*h=54
l*l*2l=54
l=3
i need the answer for 2nd question. please do me this favour any body
pls i want the explanations
if there is a weight on (n<10) grams then there is a weight on 2n grams as well..so combined there is a weight of 3n grams..now the condition is that n<10 and n is an integer..
let there be x such weights which are less than 10 grams..so total weight would be equal to x(n+2n)=108.
i.e. 3nx=108.
x= 108/(3n)
x=36/n.
now for x to be least..n has to be maximum..therefore with n as an integer and n<10 we can have n=9 which gives x=4 and choice B is answer.
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