?
Exactly how many minutes is it before eight o'clock if...
...40 minutes ago, it was three times as many minutes past four o'clock?
Puzzle Copyright © Kevin Stone
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Answer
50 minutes.
Reasoning
Between four o'clock and eight o'clock, there are 240 minutes.
In these 240 minutes, there are 4 lots of the unknown time (t) plus 40 minutes.
Therefore, 240 = 4 x t + 40.
Therefore, t = 50 minutes.
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