the difference is 4 imes the smaller number.Find the two numbers.
1(b) A bag contains some$5 anh $10 coins.There are altogether 120 coins in the bag and the total amount is$810.Find the number of $5 coin and that of $10 coins in the bag.
I want steps!Detail step!Thanks a lot!
2.Amy wants to deposit $100000 in a bank to earn some interest.Bank A offers an interest rate of 4.5% p.a. for 2.5 years.Bank B offers an interest rate of 3.45% p.a. for 40 moths. (a)In order to earn more simple interest,which bank should Amy choose?
(b)If Bank A requires a service charge of$500 and Bank B requires a service charge that is equal to 8% of the interest received,then which bank should Amy choose?
3.Mr Chan wants to paste the walls of his bathroom withtiles of dimensions 6 inches×8 inches.The dimensions of the bathroom are 8 ft.×5ft. and its height is 9ft.There are a door of 2.5 ft.×7ft. on one side of the walls and a window of 2ft.×1.5ft. on the other side of the walls.
(a)Estimate the total area of the walls of the bathroom (b)Estimate the number of tiles needed if the walls must be fully covered with tiles.If one box of tiles contains 30 pieces,estimate the number of boxed of tiles needed.
