Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 珍妮弗将在十年后年满30岁。届时，她的姐姐乔丹娜将是珍妮弗的三倍年龄。乔丹娜现在多大？


### Response:
 当珍妮弗在十年后年满30岁时，她的姐姐乔丹娜将是3*30=90岁。
乔丹娜现在比珍妮弗小10岁，所以她现在80岁。