The vegetable supermarket shipped 25 baskets of cucumbers, sold 21 baskets, and left 168 kilograms. How much does each basket of cucumbers weigh? (Solve first with arithmetic, then with equations)
蔬菜超市运来25筐黄瓜，卖了21筐，还剩下168千克，每筐黄瓜重多少千克？(先用算术法解，再用方程解)
<gadget id="calculator">25 - 21</gadget>
<output>4</output>

<gadget id="calculator">168 / 4</gadget>
<output>42</output>

<result>42</result>