In a warehouse, some boxes were stacked to form the pile shown in the figure. If each box weighs $25 \mathrm{~kg}$, how many kilograms does the pile weigh with all the boxes?
(a) 300
(b) 325
(c) 350
(d) 375
(e) 400
The correct option is (e).

$\mathrm{Na}$ In the figure, we can see one column with three boxes, four columns with two boxes, and three columns with one box. Therefore, the total number of boxes is

$$
1 \times 3 + 4 \times 2 + 3 \times 1 = 14
$$

Since each box weighs $25 \mathrm{~kg}$, the weight of the stack of boxes is $14 \times 25 = 350 \mathrm{~kg}$.