One ton is equal to 2,000 pounds, so 7 tons 400 lbs is equal to 14,400 lbs(7 × 2,000 + 400), and 4 tons 1,800 lbs is equal to 9,800(4 × 2,000 + 1,800).
Subtract 9,800 from 14,400.
14,400 - 9,800 = 4,600
Answer:
The first elephant weighs 4,600 lbs more than the second elephant.