A brain-teaser to lift up the mood =)
Here is the email passed by one of my friends. It’s quite fun I think… Let’s get started…
A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues were:
The fifth number plus the third number equals fourteen.
The fourth number is one more than the second number.
The first number is one less than twice the second number.
The second number plus the third number equals ten.
The sum of all five numbers is 30.
What were the five numbers and in what order?
For those who do not receive the email contains the same riddle from me, will reveal the answer by next week… =P
Have Fun in solving the riddle…
Lin ^ ^
March 14th, 2008 at 8:56 pm
74658
March 15th, 2008 at 10:09 pm
As expected from Chia Wei =)
March 20th, 2008 at 6:13 pm
Take the 5 numbers as: a, b, c, d, e
Based on the clues:
e + c = 14
d = 1 + b
a = 2b – 1
b + c = 10
a + b + c +d + e = 30
… to make it easier let’s make every number has the same variable (this case take ‘b’ as the standard)
a = 1 + b
c = 10 – b
d = 1 + b
For e, 14 – e = c in which, c = 10 – b, substitute these 2 formula
14 – e = 10 – b
4 = e – b
e = 4 + b
The substitute all the formulas above to
a + b + c +d + e = 30
2b-1 + b + 10–b + 1+b + 4+b = 30
4b + 14 = 30
4b = 16
b = 4
a = 2b – 1
a = 7
c = 10- b
c = 6
d = 1 + b
d = 5
e = 4 + b
e = 8
Now, the man can enter the office with this code: 74658
Some might have more effective way in solve this riddle, anyway, as long as it can let the man enter the office, it should be fine. Haha =P
March 21st, 2008 at 9:00 pm
How come A = 1+ b???
“… to make it easier let’s make every number has the same variable (this case take ‘b’ as the standard)
a = 1 + b”
Shouldn’t it be A = 2b -1???
March 22nd, 2008 at 8:23 pm
hoho… sorry sorry…
didnt check it properly… it supposes to be a = 2b-1… Baka…. haha
But the below substitution is correct d… =P
Gomen~ =P