Simplify the following: (i) √45 − 3√20 + 4√5 (ii) 3√3 + 2√27 + 7/√3 (iii) 6√5 × 2√5 (iv) 8√15 ÷ 2√3 (v) √24/8 + √54/9 (vi) 3/√8 + 1/√2