Applications of linear equations - 1. George has a collection of nickels and dimes that is worth $5.65. If the number of dimes were doubled and the number of nickels were increased by 8, the value of the coins would be $10.45. How many dimes does he have. ...

1.  George has a collection of nickels and dimes that is worth $5.65.  If the number of dimes were doubled and the number of nickels were increased by 8, the value of the coins would be $10.45.  How many dimes does he have.
2.  An express and local train leaves Mini's Lake at 3pm. and heads for Chicago 50 miles away.  The express travels twice as fast as the local, and arrives 1 hour ahead of it.  Find the speed of each train.
3.  Wesley made an extra $9000 last year from the part-time job.  He invested part of the money at 9% and the rest at 8%.  He made a total of $770 in interest.  How much was invested at 8%?