There are 281 students in 6 grades in a mountain village primary school, 46 students in each grade from grades 1 to 5. How many people are in the sixth grade?
一所山村小学6个年级一共有学生281人，1～5年级每个年级都是46人．六年级有多少人？
<gadget id="calculator">46 * 5</gadget>
<output>230</output>

<gadget id="calculator">281 - 230</gadget>
<output>51</output>

<result>51</result>