Does anybody know a algebraic formula I could make out of this problem?

Currently Dan has $600 in his bank account, while Kerri has $500 in hers.

Every Friday afternoon Dan withdraws $15. At the same time Kerri withdraws $10 knowing that she can't spend as much as Dan.

After how many weeks will their account balances be equal?

Question

Does anybody know a algebraic formula I could make out of this problem?

Currently Dan has $600 in his bank account, while Kerri has $500 in hers.

Every Friday afternoon Dan withdraws $15. At the same time Kerri withdraws $10 knowing that she can't spend as much as Dan.

After how many weeks will their account balances be equal?

anonymous · Answer

$$600-15x=500-10x$$ where x is the number of weeks.

anonymous · Answer

And how can I find the number of weeks?

anonymous · Answer

solve for x.
you can add 15 x to both sides to get 
$$600=500+5x$$ subtract 500 to get 
$$100=5x$$ divide by 5 get 
$$x=20$$

anonymous · Answer

Thanks for helping a 6th grader. I really appreciate it! I hope I see you again in the future satellite!

anonymous · Answer

Oh, and also I know it's a stupid question but where did you get 5x?

anonymous · Answer

i had 
$$-10x$$ on the right and 
$$-15x$$ on the left.  so i did this 
$$600-15x+15x=500-10x+15x$$
$$600=500+5x$$ because 
$$-10x+15x=5x$$

anonymous · Answer

yw