29√5
14√15
12√15
11√15
Correct answer is A
3 √45−12√5+16√20
= 3 x √9×5−12×√5+16×√4×5
= 3 x 3 x √5−12×√5+16×2×√5
= 9√5−2√5+32√5
= 9√5+32√5−12√5
= 29√5
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