Hi Bunuel, can you explain this
Jan and 5 of his friends sold candy bars to raise money for their school trip. Jan sold 20 bars and each of his 5 friends sold at least one bar. Did Jan sell more candy bars than each of at least 3 of his friends?
(1) The median of the number of bars sold by Jan’s 5 friends is 18.
{a, b, 18, c, d}, so at least 3 friends sold less than 20 bars (a, b and 18). Sufficient.
(2) The average (arithmetic mean) of the number of bars sold by Jan’s 5 friends is 12.
The total number of bars sold by Jan’s 5 friends is 5*12=60. Can there be a case where at least 3 of Jan’s friends sold 20 or more bars? No, since in this case the total number of bars sold by his friends would be more than 60 (20+20+20+1+1=62). Sufficient.
Answer: D.
in the 1st option, there could be a case on {1,1,18,18,18}. We can select any 3. 1,1,18(ans is no) and 18,18,18(ans is yes). similarly in the second 2ns option. So how is each statement individually sufficient