Each number is four times the previous number.
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80-20 % rule is also known as the Pareto Principle. To make it more easier to understand, this means that 80% of effects is highly come from 20% of causes.
80, 160, 320
320.
80/0.25 = (4*80)/(4*0.25)=320/1=320
There are 320 rods in a mile. Therefore, 80 rods is equal to 80/320 = 0.25 miles.