Verified Answer :

beeganah
  1. if you break it down it becomes 10.
     40 to 20 is 20
    20 to 10 is 10
    10 to 40 is 30
    40 to 20 is 20
    now if you take the difference between those and break those down its 
    20 to 10 is 10
    10 to 30 is 20
    30 to 20 is 10
    now if you break those down its 
    10 to 20 is 10
    20 to 10 is 10 
    10 is your final answer

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