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√ ab + √ cd=20
√ bk x b + √ dk x d =20 4 / (b+d) = 20 / (b+d )
b√k + d√k = 20
√k (b +d ) =20 b+d = √5
(√k (b +d )) ^2 = 400
k (b+d)^2 = 400
k = 400 / (b+d)^2 k = 4 / √5 = 4√5 / 5
k = 20 / (b+d )