The average of 10numbers is 60. Out of 10numbers the average of first 6no. is 68, and last 6numbers is 75 then find 7th number? Choose the correct choice from the following options:	A) 78	B) 65	C) 258	D) 62	E) 48

Rationale: "7 th number = sum of 1 st 6 no . s + sum of last 6 no . s - sum of 11 no . s answer = 6 * 68 + 6 * 75 - 10 * 60 = 258 answer is c"
Answer: C