You begin with $25 in a savings account and $50 in a checking account each week you deposit five dollars into savings and $10 into checking after how many weeks is the amount inchecking twice the amount in savings

The first week.
The first week there is 30 dollars in the saving account and 60 dollars in the checking account.

Amount of money in savings account after x weeks: 25+5x
Amount of money in checking account after x weeks: 50+10x

We are trying to find when 50+10x=25+2(5x)

Now all we need to do is solve.

50+10x=2(25+5x)
50+10x=50+10x        distribute
both sides are are equal, therefore every week the amount in checking is twice the amount in savings.

You would have 15$ left

25 is obviously the correct answer