What region(s) has/have the least two additional cities from 1997 to 2007? Explain why other choices are incorrect.

Question

These are the regions from 1997 to 2007. Caga 1997 = 5, 2007 = 13. Car 1997 = 3, 2007 = 9. Mima 1997 = 2, 2007 = 6. Caraga 1997 = 1, 2007 = 2. Dav 1997 = 0, 2007 = 2. Zambo 1997 = 5, 2007 = 5. What region(s) HAS/HAVE THE LEAST TWO ADDITIONAL CITIES from 1997 to 2007?

Answer 1

Zambo has no additional cities. Caraga has one additional city.  The least two additional cities are 0 and 1. All the other regions have more than 1 additional cities:

Caga has 8 additional cities, Car has 6 additional cities, Mima 4, Dav 2.

Answer 2

Caga gained (13-5) = 8 cities

Car gained (9-3) = 6 cities

Mima gained (6-2) = 4 cities

Caraga gained ( 2-1) = 1 city

Dav gained ( 2-0) = 2 cities

Zambo gained ( 5-5) = 0 city

so the region gaining the least two additional cities are Dav and Mima.