the mean of 6, 9, and 18 is equal to the mean of 12 and y. What is the value of y ?

Question

nowhereman · Answer

Can you write down what the given condition is, in mathematical terms?

anonymous · Answer

That is all I have

nowhereman · Answer

Yes, but what is the mean of several numbers in formula?

nowhereman · Answer

You see, I'm trying to help you find the solution yourself. Where is the problem — do you know what the mean is?

anonymous · Answer

Oh sorry, the mean  means average.

nowhereman · Answer

Yes and for some numbers a,b,c, how do you calculate it?

anonymous · Answer

y=10

anonymous · Answer

show me how you work it out

nowhereman · Answer

So you don't want my help?

anonymous · Answer

yeah i do but can you show me how to work it out

nowhereman · Answer

I can lead you along the path;
First you have to write down those two means as formula. Of course the one for 6,9,18 can imediately be calculated completely.

anonymous · Answer

Shine already worked it out but he/she didn't show us how to work it out

nowhereman · Answer

I don't understand, what your problem is... Why don't you do what I tell you?

anonymous · Answer

Ok

anonymous · Answer

(6+9+18)/3=(12+y)/2=>y=10

anonymous · Answer

I think you are right because you have the same answer as Shine