(2) 250/[(2375-250)/85]+85=95 (basket)

(3) (12× 3+12)/(3-1) = 24 (kg)

(4) 243× 24/15× 7/3 = 907.2kg.

[972/30]/[(243/3)/ 15]=6 (days)

(5) Number of people in each group: (13+3)/(12-10) = 8 (people)

Total population: 8× 10+ 13=93 people.