Question

This is my first time on here and I am not sure how to use this site, but I am in need of a lot of help!
My math question is about percentages.
In the 2010 Olympics, Usain Bolt ran the 100m dash in 9.63 seconds. Jim Hines won the 1968 Olympic gold with a time of 9.95 seconds.
A. Bolt's time was ___% faster then Hines' ( I got 3.3% but am not sure if this is correct)
B. Hines' time was ___% slower the Bolts. ( I got 3.2%)
C. Hines' time was ___% of Bolt's ( this on I am truly stuck on) Any one Please Help!!??

Answer 1

To compare two values, use the formula: (this-that)/that*100%
E.g. (9.63-9.95)/9.95*100 gives -3.21, meaning Bolt's time was 3.2% faster.

Answer 2

So do you think the two answers that i got are correct?

Answer 3

Did I do it backwards? Do you how would I do C. Thank you for helping me :) I appreciate it a lot

Answer 4

A. Bolt's time was 3.2% faster than Hines' so 3.3% is not correct .
B. Now you have to compare in another way: (9.95-9.63)/9.63*100=3.32, meaning Hines' time was 3.3% slower than Bolts'.
C. This is another form of comparison: you want to know what percentage H's time is that of Bolts' (so not the difference, but the whole time).

This is 9.95/9.63*100=103.3%

Answer 5

OMG thank you so much!

Answer 6

YW!