exam Maths Puzzle Numerical Ability

can you please help me solve: (((Jim has a total of 50 coins. Some are nickels and some are dimes. Although he has $4.15. How many dimes does he have? How many nickels?)))

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2a-4=13(a-5)
I cant figure out this problem. It has a fraction on the right hand side but dont know how to write it. I am not sure of these categories because I am new to college algebra. the question is Find the area of a fenced yard with a lenght of 18 yards and a width of 10 yards.