Answer :
To find the answer to this question, you simple have to find the answer to the following sequence. 10*5=50+50=100 5*5=25+25=50 Answer: 5 weeks
You begin with:
- $25 in a savings account
- $50 in the checking account.
After first week:
- $25+$5=$30 in a savings account
- $50+$10=$60 in the checking account.
After second week:
- $30+$5=$35 in a savings account
- $60+$10=$70 in the checking account.
After third week:
- $35+$5=$40 in a savings account
- $70+$10=$80 in the checking account.
After fourth week:
- $40+$5=$45 in a savings account
- $80+$10=$90 in the checking account.
After fifth week:
- $45+$5=$50 in a savings account
- $90+$10=$100 in the checking account.
You can see that after fifth week the amount in checking is twice the amount in savings.
Let x be the number of weeks, then the equation is:
25+5x=50,
5x=50-25,
5x=25,
x=25:5,
x=5.
Answer: after 5th week.