M4maths Previous Puzzles

13 May 2011 what will be the next

3,3,5,4,4,?

OPtion

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

Solution

one - 3
two - 3
three - 5
four - 4
five - 4
six - 3

Correct Option: 2 Best Solution (6)

12 May 2011 Compound interest

What would be the installment monthly on a loan of 30000 rupee for 3 months, if 12 % yearly compound interest is added monthly

OPtion

1) 10303
2) 10301
3) 10302
4) 10203
5) 10201
6) 10202
7) 10103
8) 10101
9) 10102
10) 10198

Solution

Let the installment is A
then according to the given condition,
[(100/101)]A + [(100/101)^2]A + [(100/101)^3]A = 30000
on solving we get A = 10201

Correct Option: 5 Best Solution (0)

11 May 2011 Percentage

10 % of x + 20 % of x/2 + 30 % of x/3 + 40 % of x/4 +...............
.........................+ 100 % of x/10 =

OPtion

1) 0.5 x
2) 0.75 x
3) 0.9 x
4) 1 x
5) 1.2 x
6) 1.5 x
7) 1.8 x
8) 2.4 x
9) 2.8 x
10) 3 x

Solution

There are 10 terms in the expression and each term is equal to x/10
for example 40 % of x/4 = (x/4)*(40/100) = x/10
Sum of all 10 terms = 10*(x/10) = x

Correct Option: 4 Best Solution (9)

10 May 2011 Average

The sum of 5 positive integers is 16. If we subtract the greatest integer from the sum, the average of remaining 4 integers would be 2.5. In the similar manner if we subtract the least one, the average of remaining 4 integers would be 3.75. The average of middle 3 integers will be

OPtion

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

Solution

2.5 * 4 = 10 so the greatest number is 16 -10 = 6
3.75 * 4 = 15 so the least number is 16 - 15 = 1
thus the sum of middle 3 numbers = 16 - 6 - 1 = 9
average = 9/3 = 3

Correct Option: 8 Best Solution (6)

09 May 2011 what will be the next number

3, 6, 2, 5, 1, ?

OPtion

1) 3
2) 4
3) 6
4) 7
5) 9
6) 2
7) 0
8) 1
9) 9
10) 5

Solution

10,20,30,40,50,60
divide it by 7 then reminder will be

3,6,2,5,1, 4

Correct Option: 2 Best Solution (3)

06 May 2011 combination

How many combinations can be formed by using 3 green, 2 white and 4 black balls

OPtion

1) 24
2) 3
3) 2
4) 4
5) 9
6) 60
7) 48
8) 59
9) 23
10) 1

Solution

Total methods = (3+1)(2+1)(4+1) - 1 = 59

Correct Option: 8 Best Solution (0)

05 May 2011 Business

A man invests 2000 rupee in two business. In first business , he gets a loss of 10 %, whereas in second he gets a profit of 25 %.If overall profit is 4 % of the net investment, then difference of amounts of these two investments will be

OPtion

1) 100
2) 200
3) 400
4) 500
5) 600
6) 800
7) 900
8) 1000
9) 1200
10) 1500

Solution

Loss of the first business = 0.1x ( here x is investment in first business)
Profit in the second business = 0.25(2000-x)
so 0.25(2000-x)- 0.1x = 2000*0.04 = 80
On solving we get x = 1200
so answer = 400

Correct Option: 3 Best Solution (0)

04 May 2011 what will be the next?

13, 4, 13, 1, 20, 8,..

OPtion

1) 21
2) 19
3) 17
4) 27
5) 26
6) 3
7) 8
8) 18
9) 13
10) 23

Solution

m 4 m a t h s.

s -> 19

Correct Option: 2 Best Solution (5)

03 May 2011 Tap

There are two taps in a tank. One tank is there for filling water in the tank and second is used for ejecting water from it. The first tap can fill the tank in 8 hours whereas second tap requires 10 hours for making the tank empty. If both taps are used together, hours required for filling the complete tank will be

OPtion

1) 2
2) 8
3) 10
4) 12
5) 15
6) 18
7) 28
8) 40
9) 80
10) 96

Solution

Tank filled in one hour is (1/8)-(1/10) = 1/40
so total hours required are 40

Correct Option: 8 Best Solution (0)

02 May 2011 sequence

Next number of the sequence will be
5, -7, 19, -21, 41, -43,.......

OPtion

1) 45
2) 54
3) 59
4) 65
5) 71
6) 82
7) 89
8) 92
9) 99
10) 104

Solution

1+(2^2), 2-(3^2), 3+(4^2), 4-(5^2), 5+(6^2), 6-(7^2), 7+(8^2)

Correct Option: 5 Best Solution (7)