<human>:  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?
<bot>: How many marks does Carl need to earn? ** 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.
How many marks does Carl need to earn? ** 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