I need help with these question, could you do it on paper so its easy for me to understand

5. Complete the following. (a) 100 kg of 30% salt solution by mass contains kg of salt. (b) 500 L of 40% alcohol solution by volume contains L of alcohol. (c) 2000 kg of 5% salt solution by mass contains kg of salt. (d) x L of 30% alcohol solution by volume contains L of alcohol. (e) y kg of 35% salt solution by mass contains kg of salt. (f) m kg of 9% silver alloy contains kg of 6. How many kilograms of 30% salt solution by mass and 40% salt solution by mass should be mixed to form 200 kg of 37% salt solution by mass? 7. A lab technician wants to make 500 kg of 28% alcohol solution by mixing 40% alcohol solution and 20% alcohol solution. How many kilograms of each type should be used