5 students scored a combined total of 92 * 5 = <<92*5=460>>460

4 additional students scored a combined total of 80 * 4 = <<80*4=320>>320

9 students therefore scored a combined total of 460 + 320 = <<460+320=780>>780

We know the total combined score for 10 students must be at least 85 average * 10 students = <<85*10=850>>850

Therefore, the last student must score at least an 850 - 780 = <<850-780=70>>70

# Answer

70
<|im_start|>system
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<|im_start|>user
The math teacher would be happy if the class average test score was at least 85. There are 10 students in the class, 5 of which scored a 92 on the test and 4 of which scored an 80. What would the last student have to score to at least make the teacher happy?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
70
The math teacher would be happy if the class average test score was at least 85. There are 10 students in the class, 5 of which scored a 92 on the test and 4 of which scored an 80. What would the last student have to score to at least make the teacher happy?
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