An empty truck weighs $9600 \mathrm{~kg}$. When the truck is loaded with 40 identical crates, the total weight is $38000 \mathrm{~kg}$. The weight of each crate is
(A) $460 \mathrm{~kg}$
(B) $950 \mathrm{~kg}$
(C) $1190 \mathrm{~kg}$
(D) $240 \mathrm{~kg}$
(E) $710 \mathrm{~kg}$
Since an empty truck weighs $9600 \mathrm{~kg}$ and when the 40 crates are added the weight is $38000 \mathrm{~kg}$, then the total weight of the crates is $38000-9600=28400 \mathrm{~kg}$.

Since there are 40 identical crates that weigh $28400 \mathrm{~kg}$, then the weight of each crate is $28400 \div$ $40=710 \mathrm{~kg}$.

ANswer: (E)