If R+r=13, and R-r=7, then find R and r.

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Solution

R + r = 13-------------(1)

R - r = 7 --------------(2)

(1) + (2) ==> 2R = 13 + 7 = 20

R = 20 / 2 = 10

from (1) ,

10 + r = 13

r = 13 - 10 = 3

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