NerdTests.com Quiz: Mathematical riddles test

How many of these mathematical riddles can you solve correctly? How good are you? Let us see!
In some question, an option "the next one, please" is provided, in case you find something as too hard for you.

You can also try my test about the european institutions -
Test link: www.nerdtests.com/mq/ uttake.php?id=266958
(without any spaces in the link)

A test by : Ivo Atanasov, an autistic man from Bulgaria, South-East Europe. :-)

15*5+1 = ?

18
75
76
90

1+8*(198/18) = ?

81
88
89
99
100
the next one, please

7*8=?

40
56
78

10^(1.5+0.5)=?

10
15
50
100
the next one, please

8*5 = ?

40
58
85

13*11 = ?

130
131
143
the next one, please

What is the average of the numbers 8 and 10 ?

1
7
8
9
10
18

What is the average of the numbers 5, 7 and 9 ?

7
8
9
10
63

x + y = 36.
What is the average on x and y ?

13
18
30
it can not be solved

10)

77/11+80=?

1
77
87
147

11)

37*3+5=?

43
45
46
111
116
138

12)

33*41*51*61*0=?

33415
33453
33663
34583
0
the next one, please

13)

86+100/10=?

18
19
90
96
186

14)

(1+8)*(4+6)=?

19
80
90
the next one, please

15)

5*(5+6)=?

16
55
66

16)

Do you dream of even more riddles?

Yes
No

[ report this test ]

[ edit test ]