IN A BOX THERE ARE MORE THAN 70 MARBLES. THERE ARE FEWER THAN 100 MARBLES. THE NUMBER IS 7 TIMES THE SUM OF THE DIGITS. HOW MANY MARBLES ARE IN THE BOX?

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Answers

2015-07-31T23:36:39+08:00
70< N < 100

N=84

8+4=12×7=84
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