A TBM needs to bore a 500 foot tunnel (Riddle)

tunnel-insider-tbm-needs-to-bore-500-foot-tunnel-riddle
Created by Thomas Helbig from Noun Project

A tunnel boring machine can only move forward 8 times in increments of 4’s to successfully bore a 500-foot tunnel before the cutter-head needs to be replaced, which cannot happen.

How can that be done?

 

See Answer

 

444+44+4+4+4+500

 

 

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