Is 3 tons greater than 3000 lbs?

Answer 1

Yes, regardless of whether you use the long or short ton.

1 long ton (as used in UK) = 2240 lb → 3 tons = 3 × 2240 lb = 6720 lb

1 short ton (as used in US) = 2000 lb → 3 tons = 3 × 2000 lb = 6000lb

Answer 2

Yes, it is.