2. 10/( 1.8/2.7)= 15m。

3,7515/(1+500) =15kg

The second question should be how many kilograms of water do you want?

3.6 * 500 = 1800kg

6000/500 =12kg

4.2.5g = 0.0025kg。

4000 * (5/0.0025) = 8kg