Calculate the BMI for Takalani, Tshepang, Johnes, Gert, Paul, and Ndumiso, given their weights and heights.

Given: Mass = 65 kg, Height = 1.65 m

$$A = \frac{65}{(1.65)^2}$$ $$A = \frac{65}{2.7225}$$ $$A \approx 23.8751 \approx 23.9$$

The value of A is $\boxed{\text{23.9}}$.

Given: Mass = 68 kg, Height = 1.62 m

$$B = \frac{68}{(1.62)^2}$$ $$B = \frac{68}{2.6244}$$ $$B \approx 25.9145 \approx 25.9$$

The value of B is $\boxed{\text{25.9}}$.

Given: Mass = 66 kg, Height = 1.56 m

$$C = \frac{66}{(1.56)^2}$$ $$C = \frac{66}{2.4336}$$ $$C \approx 27.1113 \approx 27.1$$

The value of C is $\boxed{\text{27.1}}$.

Given: BMI = 25.8, Height = 1.55 m

$$25.8 = \frac{D}{(1.55)^2}$$ $$D = 25.8 \times (1.55)^2$$ $$D = 25.8 \times 2.4025$$ $$D \approx 61.9845 \approx 62.0$$

The value of D is $\boxed{\text{62.0 kg}}$.

Given: BMI = 26.7, Height = 1.63 m

$$26.7 = \frac{E}{(1.63)^2}$$ $$E = 26.7 \times (1.63)^2$$ $$E = 26.7 \times 2.6569$$ $$E \approx 70.90923 \approx 70.9$$

The value of E is $\boxed{\text{70.9 kg}}$.

Given: BMI = 29.4, Mass = 81 kg

$$29.4 = \frac{81}{F^2}$$ $$F^2 = \frac{81}{29.4}$$ $$F^2 \approx 2.755102$$ $$F = \sqrt{2.755102}$$ $$F \approx 1.6600 \approx 1.66$$

The value of F is $\boxed{\text{1.66 m}}$.

Given: BMI = 25.2, Mass = 63 kg

$$25.2 = \frac{63}{G^2}$$ $$G^2 = \frac{63}{25.2}$$ $$G^2 = 2.5$$ $$G = \sqrt{2.5}$$ $$G \approx 1.5811 \approx 1.58$$

The value of G is $\boxed{\text{1.58 m}}$.