math problem solving
posted by nikki .
mr. mancho, my great dane, ate 125 hot dogs over a fiveday 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

math problem solving 
drwls
Let X be the number eaten the first day.
X + (X+7) + (X+14) + (X+21) + (X+28) = 125
5X + 70 = 125
5X = 55
X = 11
Check: 11 + 18 + 25 + 32 + 39 = 125
This couls have been obtained more easily (and without algebra) by recognizing that the number consumed on the third day (25) was the average for the fiveday period. 
math problem solving 
yUo
eleven
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