21) (2·3)⁵ / (2⁴·3³)

1. Expand the numerator: (2⁵·3⁵) / (2⁴·3³).
2. Simplify using exponent rules: 2⁵⁻⁴ · 3⁵⁻³ = 2¹·3².
3. Calculate: 2·9 = 18.