hello
to solve this system, we'll need to refresh our metric table
2000 pounds = 1 tonne
mustafa's horse ate 6,400 pounds
[tex]\begin{gathered} 2000\text{pounds}=\text{ 1 tonne} \\ 6,400\text{pounds = x tonne} \\ \text{cross multiply and make x the subject of formula} \\ x=\frac{6,400\times1}{2000} \\ x=3.2\text{ tons} \end{gathered}[/tex]the right answer would be to divide 6,400 by 2000