Human: Zack's locker is half as big as Timothy's locker. Peter's locker is 1/4 as big as Zack's locker. If Peter's locker is 5 cubic inches, how big is Timothy's locker in cubic inches? Assistant: 
How big is Zack's locker? ** Zack's locker is 5*4=<<5*4=20>>20 cubic inches.
How big is Timothy's locker? ** Timothy's locker is 20*2=<<20*2=40>>40 cubic inches.
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