# Word problem

#### Bigsfc

##### New member
Nine times a number is 30 more than three times that number. Find the number

#### Subhotosh Khan

##### Super Moderator
Staff member
Bigsfc said:
Nine times a number is 30 more than three times that number. Find the number
Assume that the number = N

"Nine times a number" ? 9*N

"Three times that number" ? 3*N

"30 more than three times that number" ? 3*N + 30

Now what.....

#### Bigsfc

##### New member
i am totall confused

#### Bigsfc

##### New member
I had 9x =45 3x=15 x=5

#### Subhotosh Khan

##### Super Moderator
Staff member
Bigsfc said:
I had 9x =45 3x=15 x=5
How did you get those numbers?

J

#### JeffM

##### Guest
Bigsfc said:
Nine times a number is 30 more than three times that number. Find the number ...
i am totall confused ...I had 9x =45 3x=15 x=5
Subhotosh Khan used N instead of x for the unknown. The choice of letters to stand for unknowns is arbitrary so you need to be a bit flexible. He showed you how to set up the problem without solving it for you. He was hoping you would do:

9N = (30 + 3N).
9N - 3N = 30.
6N = 30
N = 5.

Same answer as you got, but there is a logical route to get there. If you make a mistake in an answer such as the one that you gave, you will get no partial credit because no one knows how you arrived at the answer. (Of course some teachers do not give partial credit.)

This site can be a great resource for students, but it will be much more effective for you if you both present the problem and your work UP TO THE POINT where you got stuck. That way we can help you better.