M4maths Previous Puzzles

01 Apr 2011 Find the number

Sum of cube of a positive integer, 5 times the square of that integer, 7 times the number and 8 is 180. number will be

OPtion

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

Solution

4^3+5(4^2)+7*4+8
= 64 + 80 + 28 + 8 = 180

Correct Option: 4 Best Solution (0)

31 Mar 2011 Find the least value

Which of the following is least

OPtion

1) 40% of 78
2) 30% of 88
3) 50% of 684
4) 70% of 48
5) 20% of 98
6) 10% of 128
7) 60% of 58
8) 80% of 38
9) 90% of 28
10) 100% of 19

Solution

check the all value

Correct Option: 6 Best Solution (10)

30 Mar 2011 average

What will be the average of averages of marks of five students given below
1) 56, 67, 74, 85, 69
2) 48, 36, 40, 59, 52
3) 91, 86, 59, 73, 81
4) 50, 60, 73, 82, 49
5) 50, 57, 64, 71, 74

OPtion

1) 64.24
2) 64.62
3) 64.96
4) 65.48
5) 65.46
6) 65.42
7) 66.48
8) 66.32
9) 66.84
10) 67.46

Solution

sum of all the marks = 1606
thus average = 1606/25
= 64.24

Correct Option: 1 Best Solution (0)

29 Mar 2011 shirt and pant

A man has four pants of blue, grey, black and light black colours. His shirts colours are white, red, lined blank and box black. How many pairs of shirt and pant are possible. If following combinations are not allowed.
1) He doesn't put on blue pant and red shirt.
2) He puts on grey pant with only box black shirt

OPtion

1) 8
2) 10
3) 12
4) 14
5) 16
6) 18
7) 20
8) 22
9) 24
10) 26

Solution

Total combinations = 16
Eliminated combinations = 1+3 = 4
answer = 12

Correct Option: 3 Best Solution (0)

28 Mar 2011 find the next

35 26 19 14 ?

OPtion

1) 12
2) 13
3) 10
4) 11
5) 8
6) 15
7) 9
8) 20
9) 6
10) 14

Solution

10+25, 10+16, 10+9, 10+4, 10+1=11

Correct Option: 4 Best Solution (12)

25 Mar 2011 triangle

how many triangles can be formed if there are 10 points in a plane out of which 4 are in a line.

OPtion

1) 116
2) 120
3) 124
4) 130
5) 140
6) 156
7) 165
8) 190
9) 200
10) 240

Solution

3 points are required to form a triangle so no. of triangles formed = 10*9*8/3*2*1 = 120
but out of these points 4 are in a line so rejected methods are 4*3*2/3*2*1 = 4
answer = 120-4 = 116

Correct Option: 1 Best Solution (0)

24 Mar 2011 percentage

A boy got following marks out of 90 in 5 subjects: 56, 53, 65, 74, 78. If all the marks are printed in reverse order due to mistake for ex. 65 is printed as 56, then the difference in true and appeared percentage would be

OPtion

1) 5.4
2) 6.5
3) 7.2
4) 7.8
5) 8.0
6) 8.5
7) 9.0
8) 10.9
9) 12.0
10) 13.6

Solution

sum of the appeared marks = 326
sum of true marks = 290
difference = 326 - 290 = 36
so 36/450 = 0.08
0.08*100 = 8

Correct Option: 5 Best Solution (5)

23 Mar 2011 Book and pen

cost of 6 pens and that of 1 book are same. The cost of 72 pens and 9 books is equal to the cost of x books

OPtion

1) 15
2) 16
3) 17
4) 18
5) 19
6) 20
7) 21
8) 22
9) 23
10) 24

Solution

72 pens = 12 books
and 12 + 9 = 21 books

Correct Option: 7 Best Solution (14)

22 Mar 2011 Find the value

60% of 90 + 90% of 60 = 3% of x^2
Find the value of x

OPtion

1) 50
2) 60
3) 61
4) 69
5) 70
6) 55
7) 65
8) 29
9) 80
10) 52

Solution

60% of 90 = 54
90% of 60 = 54

108 = 3% x^2
108 = x^2*3/100

108*100/3 = x^2
x^2 = 3600
x=60

Correct Option: 2 Best Solution (20)

21 Mar 2011 What will be the next number

3 2 5 6 7 12 9 ?

OPtion

1) 15
2) 12
3) 20
4) 11
5) 30
6) 13
7) 42
8) 25
9) 30
10) 24

Solution

1+2 = 3, 1*2 = 2
2+3 = 5 2*3 = 6
4+5 = 9 4*5 = 20

Correct Option: 3 Best Solution (16)