Carl is taking a class where the whole grade is based on four tests that are graded out of 100. He got an 80, a 75 and a 90 on his first three tests. If he wants an 85 average for the class, what is the minimum grade he needs to get on his last test?
First, find the total number of points Carl needs to earn across all the tests by multiplying his desired average by the number of tests: 85 * 4 = <<85*4=340>>340 marks.
Then subtract all Carl's previous test scores to find the last score he needs to earn: 340 - 80 - 75 - 90 = <<340-80-75-90=95>>95 marks.
#### 95