Alibaba Arithmetic

Math Online Tom Circle

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Jack Ma of the Alabama.com gives this Arithmetic question to the audience,  only 1% get the answer right !

Jack has cash $50, which he uses to buy:
Clothing : $20 (Balance $50-20 = $30)
Shoes: $15 (Balance = $30-15 = $15)
Candy: $9 (Balance = $15- 9 = $6)
Food: $6 (Balance = $6 – 6=$0)

Question:
Add up the Balances = $ 30+15+6 = $51

Where does the extra $1 come from ?

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Math amateur
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