Brain Teasers
Function Table #2
A function table is a table of order pairs that follow a rule. A rule tells how one number is related to another. In this brainteaser, I will give you a function table (sometimes called an input-output table) and you need to figure out what the rule is. I will give you an example.
Example:
Input(A) Output(B)
7(A), 9(B)
13(A), 15(B)
1(A), 3(B)
3(A), 5(B)
9(A), 11(B)
The rule in this example is add 2. Now here is the real deal. Find out what the rule is.
*This one will be harder than the example. Way harder.
Input(A) Output(B)
6(A), 4.5(B)
23(A), 17.25(B)
9(A), 6.75(B)
10(A), 7.5(B)
45(A), 33.75(B)
Example:
Input(A) Output(B)
7(A), 9(B)
13(A), 15(B)
1(A), 3(B)
3(A), 5(B)
9(A), 11(B)
The rule in this example is add 2. Now here is the real deal. Find out what the rule is.
*This one will be harder than the example. Way harder.
Input(A) Output(B)
6(A), 4.5(B)
23(A), 17.25(B)
9(A), 6.75(B)
10(A), 7.5(B)
45(A), 33.75(B)
Answer
The rule to this function table is multiply A by 3, and then divide that number by 4. If you want to see it in an equation, look below.(Ax3)/4=B
Another way to write it:
(A*3)/4=B
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Comments
Or you could simply subtract 25% to get the same answer. That's what I did, and it wasn't the rule you said it was.
Great Point!!! Let me try to correct the teaser...
Dec 20, 2010
You should try something not so easy(or linear)
I'll post one
I'll post one
Dec 20, 2010
how about this one:
A B
7 11.27
3 7.08
20 29.56
A B
7 11.27
3 7.08
20 29.56
Dec 20, 2010
This one's much harder B=.5*A^1.3+5
simple, but fun. And subtracting 25% seems like the same thing as mulitplying by 3 and dividing by 4. Thanks for the teaser.
Feb 13, 2011
i did 6X = 4.5
X = 4.5/6
X= .75
Multiply the input by .75 and you get the output.
thanks for the teaser!
X = 4.5/6
X= .75
Multiply the input by .75 and you get the output.
thanks for the teaser!
I had a different rule.If you divide A by 1.33333... you get B.
It is A/1.333333333333333=B to be exact.
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