Câu hỏi:
A man phoned his daughter to ask her to buy a few things he needed for a trip. He told her she would find enough dollar bills for the purchase in an envolope on his desk. She found the note with 98 written on it.
Đáp án:
(A). $4. She had read 86 upside down. (B). Turn 9 upside down and exchange it with the 8. Both columms will add to 18.
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