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

### Instruction:
 凯蒂有13颗粉色弹珠。她比粉色弹珠少9颗橙色弹珠。她有紫色弹珠的数量是橙色弹珠的4倍。凯蒂总共有多少颗弹珠？


### Response:
 找出橙色弹珠的数量。13颗弹珠 - 9颗弹珠 = <<13-9=4>>4颗弹珠
找出紫色弹珠的数量。4颗弹珠 * 4 = <<4*4=16>>16颗弹珠
找出粉色、橙色和紫色弹珠的总数量。13颗弹珠 + 4颗弹珠 + 16颗弹珠 = 45颗弹珠