Answer each part below using only mental math, and describe your method. a. If 39 is 1% of a number, what is that number? How di
d you find your answer? b. If 39 is 10% of a number, what is that number? How did you find your answer? c. If 39 is 5% of a number, what is that number? How did you find your answer? d. If 39 is 15% of a number, what is that number? How did you find your answer?
Why? 180 divided by 4.5 is 40 seconds 200 divided by 2.5 is 80 seconds Then add the seconds. But I don’t understand how you walk so many meters in 180 seconds
