Advantages and disadvantages to the metric system? Advantages and disadvantages of the English system of measurement?

1.) The main advantages of using the metric system of measurements are that they are easy to use and do not require tough conversions. It is very easy to memorize. The main disadvantage is for people living in north America.

2.) When people complete work, English measures develop naturally. These countermeasures are of a human scale and can be easily used once mastered. One pint of beer is easier to order than 500 ml and half pound is easier to think than 250 grams. Many English system measures are applied to useful scores in everyday life. The primary disadvantage of the English system of measurement is converting from one unit to another. It's not easy to go from feet to miles, pounds to ounces, or gallons to pints. A common example is trying to remember that a square mile is 640 acres

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the answer is 0.42 is that is an option. this question provides no info