An elephant in the zoo weighs 3.4 tons, which is 0.7 tons more than three times the weight of a tiger. How many tons does a tiger weigh?
动物园中一头大象的体重是3.4吨，比一只老虎体重的3倍还多0.7吨，一只老虎体重是多少吨？
<gadget id="calculator">3.4 - 0.7</gadget>
<output>2.7</output>

<gadget id="calculator">2.7 / 3</gadget>
<output>0.9</output>

<result>0.9</result>