One man is going to buy a radio for 30 dollar, he gets 10 for each of its 3 sons.
when he gets to the shop he buys the radio for 25. so he gets home and give each of his sons 1 dollar and he keeps 2 dollars so:
9+9+9= 27 and + the 2 dollars that he kep would be = 29
where is the other dollar?
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