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Problems on Numbers Questions

NA
SHSTTON
56
Solv. Corr.
27
Solv. In. Corr.
83
Attempted
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121 / 143

Choose the correct option.

In a class composed of x girls and y boys. What part of the class is composed of girls


Ay/(x + y)

Bx/xy

Cx/(x + y)

Dy/xy

Answer: Option C

Explanation:

The Total Number Of Students Is = x+y

And total Number Of Girls=x

Thus part of the class composed of girls= Total Number Of Girls / Total No of Students

i.e x / x+y

Workspace

NA
SHSTTON
32
Solv. Corr.
44
Solv. In. Corr.
76
Attempted
0 M:0 S
Avg. Time

122 / 143

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One of the digits of a two digit number is 6,whose sum is half of there product and whose product of the half of the reverse order number. What is
the number.


A36

B60

C63

DNone

Answer: Option C

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
20
Solv. Corr.
39
Solv. In. Corr.
59
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Avg. Time

123 / 143

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If 0

As < -1 and t < -1

Bs > -1 and t < -1

Cs > -1 and t > -1

Answer: Option C

Explanation:

Here is no explanation for this answer

Workspace

NA
SHSTTON
3
Solv. Corr.
5
Solv. In. Corr.
8
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124 / 143

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In Madras, temperature at noon varies according to -t^2/2 + 8t + 3, where t is elapsed time. Find how much temperature more or less in 4pm to 9pm.


A7

B7.8

C7.5

D8

Answer: Option C

Explanation:

By putting t=4,
temp = -16/2+32+3 = 27
By putting t=9,
temp = -81/2+72+3 = 34.5
Change = 34.5-27) = 7.5

Workspace

NA
SHSTTON
2
Solv. Corr.
5
Solv. In. Corr.
7
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125 / 143

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A frog is in the bottom of a 20 m deep well. Every days it jumps 5 meters upwards and falls 4 meters down. How many days will it take for the frog to get out of the well?


A16

B20

C15

D19

E18

Answer: Option A

Explanation:

1st day it jumps 5 meters and falls 4 meters, now will be at a height of 1 meter.
2nd day it jumps to 6 meters and falls back to 2 meter.
3rd day it jumps to 7 meters and falls back to 3 meter.
.....
.....
15th day it jumps to 19 meters and falls back to 15 meters.
Finally, 16th day it jumps to 20 meters, but now the frog have reached the top of the well.
Frog reaches top of the well at 16th day.

Workspace

NA
SHSTTON
8
Solv. Corr.
10
Solv. In. Corr.
18
Attempted
0 M:0 S
Avg. Time

126 / 143

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1, 2, 3 and 4 can form 256 different four digit numbers. If digits repeated, two of them are 1111 and 1113. Then find the sum of 256 numbers.


A711040

B711000

C711038

D711042

Answer: Option A

Explanation:

s = n/2(a+L)
s = 256/2(1111+4444)
s = 711040

Workspace

NA
SHSTTON
4
Solv. Corr.
2
Solv. In. Corr.
6
Attempted
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127 / 143

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Hari has a piece of cake 60 cm long. He gives Raja half of it. He then gives Gopal 1/4th of what is left. After giving a piece to Sahi, be is left with 1/10th of the original. How much did he give to Sahil ?


A21.5 cm

B16.5 cm

C5 cm

D3 cm

Answer: Option B

Explanation:

Given : Piece of cake = 60 cm long .
He gives Raja 1/2 of it = 1/2*60 = 30 cm long.
Left with Hari now = 60-30 = 30

He gives Gopal 1/4th of what is left = 1/4*30 = 7.5
Now left = 30-7.5 = 22.5
Now let he gave Sahil = x,
So, as per question:
22.5-x=1/10*60
=> x=16.5 cm is required.

Workspace

NA
SHSTTON
6
Solv. Corr.
6
Solv. In. Corr.
12
Attempted
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Avg. Time

128 / 143

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If a lemon and apple together costs Rs.12, tomato and a lemon cost Rs.4 and an apple costs Rs.8 more than a lemon. What is the cost of lemon?


A3

B2

C1

DNone of these

Answer: Option B

Explanation:

Lets assume lemon as l, apple as a and tomato as t
As per question:

l+a=12
t+l=4
a=l+8
therefore, l+(l+8)=12
2l+8=12
2l=12-8
l=2

Workspace

NA
SHSTTON
0
Solv. Corr.
4
Solv. In. Corr.
4
Attempted
0 M:0 S
Avg. Time

129 / 143

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Four times the first of three consecutive odd integers is 6 more than twice the third. The third integer is


A7

B9

C13

D11

Answer: Option D

Explanation:

Take the odd number is n,
next odd number is n+2,
next odd number is n+4
4n=2(n+4)+6
4n=2n+14
n=7
n+4=11

Workspace

NA
SHSTTON
0
Solv. Corr.
5
Solv. In. Corr.
5
Attempted
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Avg. Time

130 / 143

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Total 100 members are writing exam. In the 48 members are writing first exam. 45 members are writing second exam. 38 members are writing third exam. 5 members are writing all the three exams. How many members are writing 2 exams?


A18

B6

C20

D21

Answer: Option D

Explanation:

Total number of exams written by 100 students = 48 + 45 + 38 = 131
Now let us say x members are writing only 1 exam, y members are writing only 2 exams, z members are writing only 3 exams.
Therefore, x + 2y + 3z = 131
also, x + y + z = 100.
Given that z = 5. So x + 2y = 116 and x + y = 95.
Solving we get y = 21.
So, 21 members are writing exactly 2 exams.

Workspace

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