Question 581814
S/6 = 8


S = 8*6


S = 48

------------------

(S + x)/7 = 8 + 1


(48 + x)/7 = 8 + 1


(48 + x)/7 = 9


48 + x = 9*7


48 + x = 63


x = 63-48


x = 15



So the 7th score must be 15