mr.mancho my great dane ate 125 hot dogs over a five day period. each day he ate seven more hot dogs than on the previous day. how many hot dogs did he eat on the first day.....

Answer 1

Read DrWLS's explanation carefully.

http://www.jiskha.com/display.cgi?id=1287095215

Answer 2

You need to use the strategy of working backwards

day 5= 125 hot dogs
day 4= 125-7=???
day 3= ???-7 etc.
day 2=
day 1=