1. ## money problem

Mr R coin bank consists of $10 bills and$5 bills only. if there 75 bills worth $450, how many$10 bills are there?

2. ## Re: money problem

Originally Posted by rcs
Mr R coin bank consists of $10 bills and$5 bills only. if there 75 bills worth $450, how many$10 bills are there?
x = number of $10 bills y = number of$5 bills

now, you set up two equations from the given information ...

3. ## Re: money problem

please correct me if im wrong:

10x + 5y = 450
75( x+ y) = 450

4. ## Re: money problem

Originally Posted by rcs
please correct me if im wrong:

10x + 5y = 450 this equation is ok ...

75( x+ y) = 450 this equation is incorrect ... x is the number of $10 bills , y is the number of$5 bills, the total number of bills is 75
... fix it.

5. ## Re: money problem

Originally Posted by skeeter
... fix it.
10x + 5y = 450
x + y = 75

6. ## Re: money problem

Originally Posted by rcs
10x + 5y = 450
x + y = 75
good ... solve the system.

7. ## Re: money problem

Originally Posted by skeeter
good ... solve the system.

thank you skeeter great Mentor!