Cutting Logs
Level
2
A lumberjack can cut a log into 5 pieces in 20 minutes. How long does it take for a log to be cut into 10 pieces?
48 minutes
40 minutes
45 minutes
36 minutes
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1 solution
If a lumber jack takes 20 mins to cut into 5 pieces, then each cut must be 4 mins because to cut into 5 pieces the cuts are always less by 1 so only 4 cuts. So 10 pieces must take 36 mins because 4x9=36.