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?
Options:
A . Rs. 25
B . Rs. 18
C . Rs. 15
D . Rs. 22
E . None of these
Answer: Option C
Total members in the group = 7Average amount = Rs. 20Total amount with them = 7 * 20 = Rs. 140One number has Rs. 50. So, the amount with remaining 6 people = 140 - 50 = Rs. 90The average amount with them = 90/6 = Rs. 15.
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