Question

To earn at least a C in her Psychology course, Cierra must have a test average of at least 70. Cierra has grades of 68, 82, 65, and 71 on her first four tests. What minimum score does Cierra need to make on the fifth test to earn at least a C in her Psychology course?

Answer 1

The minimum score is 64. let the minimum score=x. 68+82+65+71+x/5=70. test average=70. 68+82+65+71+x=350. 286+x=350. x=350-286. x=64