Why is the storage of apps on my mac book air so large?

I have just downloaded Os x Yosemite on my mac book air, and when I checked my storage my app's section is very large. It says I have 43.33GB of apps, but when i check the amount of my apps in finder it only says I have about 10GB. One day i check it's 36.45 the next day it was 43.33 every when i didn't download or delete any apps on my computer. Why is this happening?

    Re-index Macintosh HD.
    Do this twice.
   System Preferences > Spotlight > Privacy
   http://support.apple.com/kb/ht2409

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