Question 156075
As the first 5 tests have the same score, we suppose they all scored x.
So the last test had a score of x - 12.
Thus the scores were: x, x, x, x, x, x - 12.
Their average was {{{(x + x +x+x+x+x-12)/6=(6x-12)/6=x - 2}}}
As the average was 97, we have
x - 2 = 97
Solving the equation for x, we obtain:
x = 99
So the score for the first five test was 99.