# Word problems with equations

Last updated: 13 Oct 2008

We will begin with an example of a word problem and then look at how to use equations to solve it

Carl has twice as much money invested in stocks as in bonds. Stocks earn 10% interest per year and bonds 5% per year.

If Carl earned a total of $800 dollars from his stocks and bonds last year how much money did he have invested in stocks?

- $9,600
- $8,000
- $6,400
- $4,000
- $3,200

If you feel brave you can have a go at it now.

My advice would be to follow these guidelines.

- Summarize
- Write equations, which contain the information given to you in the question.
- Use sensible variable names for example the first letter of the thing that the variable represents.
- Identify answer i.e. write down exactly what you are looking for.

- Solve
- Find the solution for the equstions you have written down.

Now lets work through the question together and see how you have done.

6400

Ans:4000

sorry its 6400

6400