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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? [Ref: ZOIC] © Kevin Stone50 minutes: between four o'clock and eight o'clock we have 240 minutes. In these 240 minutes we have 4 lots of the unknown time (t) and 40 minutes. Therefore 240 = 4 x t + 40. Therefore t = 50 minutes. QED.
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