61.Eight people are planning to share equally
the cost of a rental car. If one person withdraws from the arrangement and the
others share equally the entire cost of the car, then the share of each of the
remaining persons increased by:
A. 1/7
B. 1/8
C. 1/9
D. 7/8
Answer:
|
Option : A
|
Original share of 1 person =
|
1
|
|
8
|
|
New share of 1 person =
|
1
|
|
7
|
|
Increase =
|
|
1
|
-
|
1
|
|
=
|
1
|
|
7
|
8
|
56
|
|
Required fraction =
|
(1/56)
|
=
|
|
1
|
x
|
8
|
|
=
|
1
|
|
(1/8)
|
56
|
1
|
7
|
|
62.A classroom has equal number of boys and
girls. Eight girls left to play kho-kho, leaving twice as many boys as girls in
the classroom. What was the total number of girls and boys present initially?
A. 16 B.
24
C. 32 D.
48
Answer:Option :C
Let the number of boys = x.
Then, number of girls = x.
Now, 2( x - 8) = x.
x= 16.
Total number of students = 2x = 2 x16 = 32.
63.A man earns on the first day and spends
Rs. 15 on the next day. He again earns Rs. 20 on the third day and spends Rs.
15 on the fourth day. If he continues to save like this, how soon will he have
Rs. 60 in hand?
A. on 17th day
B. on 27th day
C. on 30th day
D. on 40 th day
Answer:
Option : A
Money
earned in 2 days = Rs. (20 - 15)
|
⇒
Money earned in 16 days =
|
|
5
|
x 16
|
|
= Rs. 40
|
|
2
|
On
17th day, money in hand = Rs. (40 + 20 ) = Rs. 60
64.David gets on the elevator at the 11th
floor of a building and rides up at the rate of 57 floors per minute. At the
same time, Albert gets on an elevator at the 51st floor of the same building
and rides down at the rate of 63 floors per minute. If they continue travelling
at these rates, then at which floor will their paths cross ?
A. 19
B. 28
C. 30
D. 37
Answer:
Option : C
Suppose
their paths cross after x minutes.
Then,
11 + 57x = 51 - 63x
⇒ 120x = 40
|
⇒
Number of floors covered by David in (1/3) min. =
|
|
1
|
x 57
|
|
= 19
|
|
3
|
So,
their paths cross at (11 +19) i.e., 30th floor.
65.How many pieces of 85cm length can be cut
from a rod 42.5 metres long?
A. 30
B. 40
C. 60
D. None of these
Answer:
|
Option : D
|
⇒ Number of pieces =
|
|
42.5 x
|
100
|
|
=
|
4250
|
= 50
|
|
85
|
85
|
|
66. (6/119) * (63/8) * (17/9) = ?
A. 2/3 B. 3/8
C.9/14 D. 3/4
Answer:
3/4
Explanation:
Help us to explain question in discussion
67. If a-b= 3 and a2+b2=29, find the value of
ab
a. 10
b. 12
c. 15
d. 18
Answer: Option A
Explanation: 2ab = (a2 + b2) - (a - b)2
= 29 - 9 = 20
=> ab = 10.
68. ((469 + 174)2 - (469 - 174)2)/(469 x 174)
= ?
a. 2
b. 4
c. 295
d. 643
Answer: Option b
Explanation: Given exp. = ((a + b)2 - (a -
b)2)/ab
=4ab/ab = 4
