Teresa is participating in a 4day cross-country bike challenge. She biked it for 61, 67, and 66 miles on the first three days. How many miles does she need to bike on the last day so that her average (mean) is 63 miles per day?

Teresa is participating in a 4day crosscountry bike challenge She biked it for 61 67 and 66 miles on the first three days How many miles does she need to bike o class=