The average amount with a group of seven numbers is Rs. 20. If the newly joined member has Rs. 50 with him, what was the average amount with the group before his joining the group?\nOptions:\n(A) Rs.17\n(B) Rs.76\n(C) Rs.15\n(D) Rs.72\n(E) Rs.71 Stream of consciousness first, then make a decision:
User
Total members in the group = 7\nAverage amount = Rs. 20\nTotal amount with them = 7 * 20 = Rs. 140\nOne number has Rs. 50. So, the amount with remaining 6 people = 140 - 50 = Rs. 90\nThe average amount with them = 90/6 = Rs. 15.
Thus, the answer is (C).
Assistant