There are 280 students in the sixth grade, of which boys account for 4/7 of the total number. How many boys are there in the sixth grade?
六年级有280名同学，其中男生占总人数的(4/7)，六年级有多少名男生？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">280 * (4/7)</gadget>
<output>160</output>

<result>160</result>