Lisa is skateboarding at a speed of three miles per hour. A dog starts to chase her, and she
speeds up to seven miles per hour. What is her
change in speed in miles per hour?

4mph change

Step-by-step explanation:

Let us assume that the number is = x
Then the equation can be written as
25x/100 = 100
25x = 100 * 100
25x = 10000
x = 10000/25
x = 400
So the required number is 100. In this case, understanding the question is of immense importance. Once the words of the problem are converted to numbers, then there is no issue left. It is a straight forward problem otherwise. Hopefully i have explained this problem to you for answering any such problems in the future.