Puzzle 57
What is the 10th prime number?
2, 3, 5, 7, …
workings
hint
answer
print
www.brainbashers.com
/puzzle/zhgx
share
Hint
2, 3, 5, 7, 11, 13, 17, 19, 23, …
Answer
29.
The first ten prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
Puzzle 58
What number is …
… one half of one third of one quarter of 360?
Puzzle Copyright © Kevin Stone
workings
hint
answer
print
www.brainbashers.com
/puzzle/zdft
share
Hint
Try working backwards.
Answer
15.
Reasoning
One quarter of 360 is 90.
One third of 90 is 30.
One half of 30 is 15.
Puzzle 59
Here is a curious grid! The sums of the shapes are shown at the end of each row, and at the bottom of each column.
What is the missing sum, and what is each shape worth?
Puzzle Copyright © Kevin Stone
workings
hint
answer
print
www.brainbashers.com
/puzzle/zjfc
share
Hint
Look at the first and third columns first.
Answer
The missing sum is 40.
Circle = 12
Star = 3
Square = 7
Triangle = 9
Reasoning
Looking at Column 1 and Column 3 we have:
[1] Square + Star + Circle + Square = 29
[2] Square + Square + Triangle + Star = 26
If we subtract [1] – [2] we get:
[3] Circle – Triangle = 3
And Row 3 is:
[4] Circle + Circle + Triangle + Circle = 45
If we add [3] + [4] we get:
Circle + Circle + Circle + Circle = 48
So, Circle = 12.
Using [3] we find that Triangle = 9.
Using Column 2 we find that Star = 3.
Using Row 1 we find that Square = 7.
Double-Checking
The rows add to: 35 + 26 + 45 + 25 = 131.
The columns add to: 29 + 36 + 26 + 40 = 131.
The rows and columns must add to the same number, so this could have been used a shortcut to the missing sum.
In total, there are:
5 Squares = 5 x 7 = 35
5 Circles = 5 x 12 = 60
3 Stars = 3 x 3 = 9
3 Triangles = 3 x 9 = 27
Which is also a total of 131.
So all of the totals are the same, as expected.
Puzzle 60
The following words have had their vowels (AEIOU) removed, can you find the missing animals?
rdvrk
rndr
prcpn
rhncrs
sqrrl
clt
frrt
sknk
dnky
ntlp
Puzzle Copyright © Kevin Stone
workings
hint
answers
print
www.brainbashers.com
/puzzle/zizw
share
Hint
One of the words is antelope.
Answers
rdvrk = aardvark
rndr = reindeer
prcpn = porcupine
rhncrs = rhinoceros
sqrrl = squirrel
clt = ocelot or colt
frrt = ferret
sknk = skunk or skink
dnky = donkey
ntlp = antelope