A riddle question number 17
Algebra
Level
2
Sam keeps marbles in a box everyday in such a way that the number of marbles in the box doubles with each passing day. For e.g., he puts in 1 marble on the first day, 2 on the second day, 4 on the third day and so on. The box gets full on the 18th day. On which day was the box half full?
The answer is 17.
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1 solution
The mables gets doubled. Let’s say there are 500 marbles in the 17th day, on the 18th day the box was full, here was 1000 marbles in the box on the 18th day. On the 17th day the box was half full.