How Many Cookies Did Tim Eat on the First Day?

[medeco]

Hello,
I would love to get help or a formula to help figure out my son's word problem he arrived with this afternoon for Homework on his first day back to school here in Georgia.

The problems is:

Tim ate 100 cookies in 5 days. Each day he ate 6 more than he did the day before.
How many cookies did he eat on the 1st day?

Please help me help my son solve this problem.
Thanks,
Pat
E-mail: dcvgnola@yahoo.com

 

[Cesium]

Hi there,

Each day Tim eats six more cookies than the previous one.

Let x = the number of cookies Tim ate on the first day
x+6 = 2nd day
x+12 = 3rd day
x+18= 4th day
x+24 = 5th day

x + (x+6) + (x+12) + (x+18) + (x+24) = 100
5x + 60 = 100

Your son should be able to figure it out from there. Solve that equation and that's your answer. Make sense?