Question

Eight persons went to a bar. Seven of them spent Rs. 800 each and 8th person spent Rs. 210 more than the average expending of all the 8 persons. What was the total money spent by them?

• A. Rs. 6460
• B. Rs. 6820
• C. Rs. 6640
• D. Rs. 6500

Answer 1

Answer:

C. Rs. 6640

Solution: GIVEN: Eight persons went to a bar. Seven of them spent Rs. 800 each and 8th person spent Rs. 210 more than the average expending of all the 8 persons. CONCEPT: Basic average concept. FORMULA USED: Average of n numbers = Sum of n numbers/n CALCULATION: Suppose average expending of all the 8 persons = X So, (800 × 7 + X + 210)/8 = X ⇒ 7X = 5810 ⇒ X = 830 Hence, Total money spent by them = 8X = Rs. 6640