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To go to sleep, Oliver counted by 6s starting from 15. Thus the first few numbers he named were
15, 21, 21, 33......
The last number he named before he fell asleep was 1107. How many numbers did Oliver name?

 Oct 22, 2020
 #1
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[1107 - 15] / 6 + 1 =183 numbers

 Oct 22, 2020

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