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Posts under Tom

Easy and True

Posted by ragknot under Tom (2 Responds)

Solve this equation …X=A*LOG(B*X+D)
A=12, B= 4, and D=7, learn the X.
It is easy and true in Excel. Type a guess of X in a cell A1, then below the guess, type … =12*Log(4*A1+7) Then copy the cell A2 to about 30 cells. An the X number will change until the X is [...]

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Riddle Time (1) – I am…?

Posted by DP under SharedPuzzle, Tom, wordfun (1 Respond)

I am in the profile of some pretty great things.
If you just want to play, push me.
This is hint #3.
I am _______________ ?

Stacked Deck (part 4)

Posted by DP under Logic, Mathemagic, MathsChallenge, Tom (5 Responds)

Andy, Bob, Charlie, and Dave are ready to play another round of cards. This time it is Charlie’s turn to deal.
The cards are sorted and Charlie decides to only use the Red cards (Hearts & Diamonds).
Three [3] cards are dealt one-at-a-time to each of the four [4] players. Highest pair wins; Aces are low.
If no [...]

Solution in Excel

Posted by ragknot under Tom (2 Responds)

Equation is … X=10+Log(20*X)
Loop 1 is =10+LOG(20*D4) the D4 is the guessed number above it. (Cell D4 where I guess 100)
Eash loop uses X for the number above it and before 20 loops it stops changing.
Guess a X 100 [...]

Easy and True

Posted by ragknot under Tom (7 Responds)

I did this easy and true computation about 3 years ago.
To compute X, when X is on both sides of the equation,
but one side, the X, and maybe other numbers are in a Log,
you can easily compute the X easy.
Example, find the X to several digits when X=10+Log(20*X).
Just guess an X and compute the [...]

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Find the missing number

Posted by Chris under Tom (7 Responds)

A Mr. Piyush has posted the following:
Find the missing number
5 : 24 :: 8 : x
Options are:
a. 65
b. 63
c. 62
d. 64

Communicating recipients

Posted by Zorglub under Tom (5 Responds)

Three recipents R(0), R(1) and R(2) each contain an integer volume v0(0) ≥ v0(1) ≥ v0(2) ≥ 1.  Each recipient is large enough to contain the combined volumes.  You are allowed to transfer some liquid from one recipient to another, only if the receiving one doubles its volume.  Show that there is always a way [...]

Easy as 123451

Posted by Zorglub under Tom (5 Responds)

A function f takes a positive integer and returns another one by moving the leftmost digit to the right.
For example f(12345) = 23451
What is the smallest strictly positive integer n such that f(n) = 1.5 n

Can You Bet Better?

Posted by Karl Sharman under Tom (4 Responds)

Would you take this bet?
Your friend he’s going to pick two different random numbers from a distribution not known to you. He will then write the two numbers of two small pieces of paper and put each one in each of his enclosed hands. You then pick a hand and he will reveal the [...]

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Easy Maths Primer

Posted by Karl Sharman under Tom (3 Responds)

The prime 41, can be written as the sum of six consecutive primes:
41 = 2 + 3 + 5 + 7 + 11 + 13
This is the longest sum of consecutive primes that adds to a prime below one-hundred.
The longest sum of consecutive primes below one-thousand that adds to a prime, contains 21 terms, and [...]

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