The average of your first 6 tests is 82. If your test average after your seventh test is an 80.5, what did you score on the seventh test?

Question

campbell_st · Answer

well the total of the 1st 6 tests is 6 x 82

so average of the 7th test is 80.5 

so 

80.5 = (6 x 82 + S)/7

solve for s... that is the score in the 7th test

anonymous · Answer

how do you solve for s

campbell_st · Answer

multiply both sides of the equation by 7... 

then subtract (6 x 82) from both sides of the equation