Submit a question to our community and get an answer from real people.

Allison bowled a total of 615 in four games. What must her score be on the fifth game to have a tournament average of 150?

Math Problem I need to know how to get the answer which is 135. Mean Median and Mode

Report as

The fifth score should be 135. Equations can be difficult to type and read, so I'll try to explain. X=the score of the fifth game. 615+X is the total of all five games. To find the average, you would divide that total by five.

(615 + X) / 5 = 150. You want to isolate X. So multiply both sides by 5.
615 + X = 750 Next subtract 615 from both sides.
X = 135

Report as
We figured another way of doing it Take the average per game which is 150 times that for total amount of games , 150 * 5 = 750 and subtract that from her total 615, 750-615= 135 :)
Report as
Very creative! Perfectly acceptable. If you want brownie points, show both ways! Well done.
Report as
What do you mean Multiply both sides by 5.?
do you mean 615+x *5
or 615*5 and 150*5
or what ?
Report as
I put the 615+X in parenthesis. That whole phrase is over 5. I'll try to type it like you'd write it on paper, but I can't underscore on an iPad. Lowercase x means multiply. Uppercase X is the variable.

615+X=150
-------
5

When you multiply both sides by 5, the 5 under the phrase cancels out.

5x(615+X)=5x150
-----------
5

615+X=750
615-615+X=750-615
X=135
Report as
Ty so much :P
Report as
You're welcome!
Report as
Dear Happy2BeHere2,
That is a great idea to use x for
"times" and X for the variable X.
Report as
Thank you. I just wish I wasn't so limited with my tiny keyboard. The other day someone asked what the symbol was for a new paragraph. I couldn't type a pilcrow, so I had to look it up and give a link. It was a bit frustrating and time consuming. Oh well, it worked!
Report as

The fifth score should be 1.2. To get the value of this, you need to get a number (x) to represent the scores on the fifth game. Add this to 615 and then divide by 5 to get 150. This means you need to have 615 + x/5 =150. This will give you 123x=150 then get the value of x =150/123, which is 1.2.

Report as
The fifth score must be 135. But I do not know the process on how to get this answer.
Report as

(615 + x)/5 = 150
times 5. times 5
615 + x = 750
-615. -615