Ok,
7/16 inch is the radius, but 1 inch is 2 miles.
So we know that actual radius is (7/16)*2miles = 7/8 miles = radius
so the area of the circle
(7/8)^2*3.14
49/64 * 3.14
since it's estimate, let's round up.
50/65 is 0.8, close enough. round down 3.14 to the closest integer = 3
3x0.8 = 2.4
B
You need to round up or down to closest number without effecting the answer
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Source: Beat The GMAT — Problem Solving |
i see, this way is easier. i did the other way (calculated the area in inch and then try to convert to miles, but forgot that in this case it is miles^2)
just curious, is it possible to solve this problem by calculating the area in inch first and then make it into square miles
just curious, is it possible to solve this problem by calculating the area in inch first and then make it into square miles
