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The operator between 5 and 312 cannot be seen.
0.016
0.016
5/8 *312 = 195.
307
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0.4
(312)/(2 and 1/2) = (312)/(5/2) = (312x2)/5 = 624/5 = 124 and 4/5 hours
312/2 = 156 so 156 x 2 = 312 Simple...
312/390 = 4/5
312 ÷ 60 = 5 minutes 12 seconds
15,600 is 5% of 312,000