She percentage of change would be the percentage of reduction which is a 25% change. I found this out by doing 20-15 = 5 so 5/20 simplified fully would be 1/4 and 1/4 as a percentage is simply 25%. I can now check my answer by doing 25% of $20 which is $5 and take this away from the original amount. So 20-5 is therefore $15, the correct answer! ;)
If there are 4 dogs and they each eat 2 pounds of food each day. Then, all together there are 8 pounds of food getting eaten each day. You will want to divide 456 by 8.
456/8= 57 days.
456 punds of dog food will last 57 days for 4 dogs.
We know that we are adding the two expressions because the question says "sum" which means that we need to add. Let's combine like terms. We know that x + 2x = 3x and 5 + 3 = 8 so the answer is 3x + 8.
