The ratio of donations from the fifth and sixth graders of Hongxing Primary School to the disaster-stricken areas in Sichuan is 3:4.
红星小学五六年级学生向四川灾区捐款数额的比是3：4，五年级一共捐款2400元，六年级一共捐款多少元？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">2_400 / (3/4)</gadget>
<output>3_200</output>

<result>3_200</result>