20. The cost of 4L of oil and 50L of gasoline is $42.50. The cost of 3L of oil and 35L of gasoline is $30.30. Determine the cost of 1L of oil and IL

I need help on these word problems. please help. it talks about finding the slant height and the others are about angle of elevation and such

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20.The cost of 4L of oil and 50L of gasoline is $42.50. The cost of 3L of oil and 35L ofgasoline is $30.30. Determine the cost of 1L of oil and IL of gasoline. [4 marks]21.When Zachary rented a car for 3 days and drove 160 km, the charge was $124. When herented the same car for 5 days and drove 400 km, the charge was $240. What was thecharge per day and the charge per kilometre? [4 marks]