River can have around 19 to 22 new treats to remain in Calorie range
Given :
River consumes between 510 and 540 calories per day. There are 320 calories in one serving of dog food.
River has new treats that are 10 calories each.
Let x be the number of new treats
River gets 10x calories from x new treats
There are already 320 calories in one serving of dog food.
So total calories dog consumes is [tex]320+10x[/tex]
The range River consumes is between 510 and 540
[tex]510\leq total \; consumes \leq 540\\510\leq 320+10x\leq 540\\510-320\leq 320+10x-320\leq 540-320\\\\190\leq 10x\leq 220\\\\Divide \; by \; 10\\19\leq x\leq 22[/tex]
She can have around 19 to 22 new treats to remain in Calorie range
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