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

### Instruction:
 格兰特的假期是凯尔文上课次数的四倍。如果凯尔文上了90节课，格兰特和凯尔文总共有多少假期和课程？


### Response:
 格兰特有4 * 90 = <<4*90=360>>360个假期。
总共，他们有360 + 90 = <<360+90=450>>450个假期和课程。