Lawrence records the number of minutes he reads each day show below
Day 1: 75 mins
Day 2: 30 mins
Day 3: 25 mins
Day 4: 50 mins
Day 5: 80 mins
How many minutes must Lawrence read on the sixth dat of have mean of 55 minutes read for the 6 day?
6 * 55 = 330 minutes
Add the time he read the first five days. Subtract the sum from 330 to find how long he needs to read the sixth day.