Chang is participating in a 4-day cross-country biking challenge. He biked for 70, 63, and 66 miles on the first three days. How many miles does he need to bike on the last day so that his average (mean) is

65miles per day?

Question

Dominique Cordova

4 February, 10:20

+3

Answers (1)

Know the Answer?

Alejandro Lam · Answer 1

(70 + 63 + 66 + x) / 4 = 65

(199 + x) / 4 = 65

199 + x = 65 * 4

199 + x = 260

x = 260 - 199

x = 61 < = = he would need a 61

Chang is participating in a 4-day cross-country biking challenge. He biked for 70, 63, and 66 miles on the first three days. How many miles does he need to bike on the last day so that his average (mean) is65miles per day?