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

### Instruction:
 在他的手机相册中，马拉基的去年和今年自拍照的比例是10:17。如果他的相册中有2430张照片，今年他比去年多拍了多少张照片？


### Response:
 比例的总和是10+17=<<10+17=27>>27
比例的差是17-10 = <<17-10=7>>7
今年，马拉基比去年多拍了7/27*2430 = <<7/27*2430=630>>630张自拍照。