exam Maths Puzzle Numerical Ability

Carl is a years old. His sister Jenny is six more than twice his age. What is the average of their ages?

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exam Other Question

A man has twenty coins consisting of dimes and quarters. If the dimes were quarters and the quarters were dimes he would have 90 cents more than he has now. How many dimes and quarters does he have.

.10x+.25y=z
.25x+.10y=z+.90

I am stuck. Solve the inequality [x^2 - 4X]<5. Its mod x^2-4x less than 5.
Can some help me in solving this?