JAMB 2003 · UME · Q6

The sum of four numbers is $1214_5$ . What is the average expressed in base five?

Worked solution (try it first)

Change to base ten: $1214_5 = 125 + 50 + 5 + 4 = 184$ .
The average of four numbers is $184 \div 4 = 46$ .
Change back: $46 = 1 \times 25 + 4 \times 5 + 1$ , so the average is 141 in base five, option C.