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Gmat Prep: circular cloth

Expert replies
Source: — Problem Solving |

by oct07 » Mon Dec 03, 2007 9:08 pm
Rtray = 1/2(24) = 12
Rcloth = 1/2(20) = 10

We need to find:
(S tray - S cloth)/S tray
= (TT Rtray^2 - TT Rcloth^2) / TT Rtray^2 (divide TT for both sides)
= (Rtray^2 - Rcloth^2) / Rtray^2
= (12^2 - 10^2)/ 12^2
= 44/144
= 11/36

As is C
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