Score on tests

On the first six tests in his Mathematics subject, his scores were 92, 82, 86, 93, 96, and 91. If he took the seventh test and raised the mean of his scores by exactly one point, what is his score on the 7th test?

Correct answer:

x =  97

Step-by-step explanation:

s6=92+82+86+93+96+91=540  m=6s6=6540=90  (m+1) 7=s6+x (90+1) 7=540+x  x=97  x=197=97  x=97

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