Question

while riding her bike to the ocean and back home 6 times, mandi timed herself at 55 min 63 min 48 min 53 min64 min and 58 min. she had set a goal of averaging 56 min for her rides. how many min will she need spend on her seventh ride to attain her goal?

Answer 1

You know that to find the average, you add all the terms and divide that by the number of entries you have, in this case 7.
So add all 7 entries, the 6 that you are given and the last one which is x since it is unkown. so you will have:
(341x)/7 = 56.
Then just solve for x.