exam Maths Puzzle Numerical Ability

Thanks for your help!!
Jill has $3.50 in nickles and dimes.If she has 50 coins, how many of each type of coin does she have? McGraw Hill 6th edition,8.2, # 56.

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exam Other Question

Find the mean and the median.
-2, -7/4, 3/4, 4, 9
These are my choices. I came up with Mean 2, Median 3/4 but I am not positive.

Mean 2, Median 3/4
Mean 10, Median 2
Mean 2, Median 2
Mean 10, Median 3/4
x+y+z=-3
2x+5y+2z=-12
-x+9y-3z=-11