Given the conversion factor 3.28 ft/ 1m which cube above has the larger surface area cube a is 7’ cube b is 2m

The first thing that we are going to do in passing everything to the same unit.
 We have then:
 Cube A:
 7 * (1 / 3.28) = 2.13 m
 Cube B:
 2 m
 The surface area of a cube is:
 A = 6 * L ^ 2
 Where,
 L: side
 Since cube A has a longer side (2.13m) then it will have the largest surface area.
  
 Cube A has the larger surface area