book Maths Puzzle Numerical Ability

For what values of d is an angle with measure 3.6d an acute angle? Please explain and solve.

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book Other Question

A mother leaves an estate worth £150000 to be divided between her two daughters divided according to their ages 24 and 26. However, death duties of 20% must be paid on the estate. Solve by substitution -

5x - 2y = -5
y - 5x = 3