M4maths Previous Puzzles

10 Dec 2010 Business profit?

Four men start a business. The shares of first & second are equal in profit. Share of third are in profit is double that of
second & that of fourth is again twice that of third. If profit of third is 75000. Then overall profit is

OPtion

1) 300000
2) 150000
3) 225000
4) 400000
5) 600000
6) 750000
7) 125000
8) 250000
9) 375000
10) 900000

Solution

The ratio of profits of four persons is 1 : 1 : 2 : 4
Share of third is 75000 hence total profit = (8/2) * 75000 = 300000

Correct Option: 1 Best Solution (6)

09 Dec 2010 Policy output?

A man deposits 5000 rupee yearly. After his two yearly installment, he stops the deposition. The amount he will receive
after 2 year with a yearly interest of 10% is

OPtion

1) 11750
2) 11250
3) 11500
4) 11600
5) 11900
6) 11550
7) 11650
8) 11700
9) 11525
10) 11510

Solution

Output for first 5000 rupee is 5000*1.1*1.1 = 6050
Output for second 5000 rupee is 5000*1.1 = 5500
Total output = 6050 + 5500
= 11550

Correct Option: 6 Best Solution (5)

08 Dec 2010 How many words are possible?

How many words can be formed by using the consonants of the word REMOTE ?

OPtion

1) 2
2) 5
3) 6
4) 3
5) 360
6) 7
7) 180
8) 20
9) 10
10) 90

Solution

There are 3 consonant R,M,T
Hence total words are
3*2*1
=6

Correct Option: 3 Best Solution (11)

07 Dec 2010 How many prime number

How many numbers between 20 & 50 are prime numbers?

OPtion

1) 2
2) 3
3) 6
4) 4
5) 5
6) 7
7) 8
8) 9
9) 10
10) 1

Solution

[23,29,31,37,41,43,47]

Correct Option: 6 Best Solution (8)

06 Dec 2010 average marks?

The average of the marks of maths test of 20 student is 9. If the marks of 5 new students are
9,5,3,2,1 the the new average marks is

OPtion

1) 11
2) 10
3) 9.5
4) 9
5) 8
6) 8.5
7) 7
8) 7.5
9) 5
10) 6

Solution

(20*9)+5+4+3+2+1/25 = 8

Correct Option: 5 Best Solution (8)

03 Dec 2010 Find the ration

10% of a number x is 17.5% of other number y.
Ration of x and y is

OPtion

1) 3/6
2) 4/5
3) 4/7
4) 5/7
5) 5/14
6) 3/4
7) 7/4
8) 3/7
9) 4/17
10) 4/35

Solution

Ration of x & y is
10*x/100 = 17.5*y/100
4x=7y
x/y = 7/4

Correct Option: 7 Best Solution (11)

02 Dec 2010 How many solution

the sum of 3 numbers x,y,z is 6. Possible integral solution are, if it is given that
x != y != z != 0
where (!= means not equal to)

OPtion

1) 1
2) 2
3) 3
4) 4
5) 5
6) 6
7) 7
8) 8
9) 9
10) 10

Solution

possible values are (1,2,3)
so possible solution are
3! = 3*2*1
=6

Correct Option: 6 Best Solution (6)

01 Dec 2010 What will be the next number

5 8 12 18 24 30 36 42 ?

OPtion

1) 44
2) 48
3) 52
4) 50
5) 56
6) 62
7) 49
8) 64
9) 46
10) 64

Solution

in the first step select the prime number
2 3 5 7 11 13 17 19 23 29
add two adjcent number at at time you will get the series
5 8 12 18 24 30 36 42 52

Correct Option: 3 Best Solution (5)

30 Nov 2010 Conditional Probability

There are two beg first contains 10 white and 5 red balls, where as second beg contains 8 white and 12 red ball.
A red ball is selected from one of the beg. what will be the probability of its coming from second beg.

OPtion

1) 1/3
2) 1/2
3) 5/13
4) 9/14
5) 3/5
6) 1/5
7) 5/14
8) 3/7
9) 7/13
10) 1

Solution

Required probability
P(sec/red) = { P(red/sec) . P(sec) }/ {(P(red/sec).P(s)+ P(Red/F).P(F))}
= (12/20 * 1/2)/(12/20*1/2 + 5/15 * 1/2)
= 9/14

Correct Option: 4 Best Solution (5)

29 Nov 2010 die thrown

A fair die is thrown 3 times what will be the probability of getting 3 consecutive numbers in increasing order.

OPtion

1) 1/2
2) 1/3
3) 1/12
4) 1/6
5) 1/216
6) 1/72
7) 1/144
8) 1/36
9) 1/54
10) 1/108

Solution

there are 4 favorable case
(1,2,3)
(2,3,4)
(3,4,5)
(4,5,6)
so the probability is 1/6*1/6*1/6*4
=4/216
=1/54

Correct Option: 9 Best Solution (5)