exam Maths Puzzle Numerical Ability

Steven invests $2000 into a GIC which will double every five years, wheras Dana invests $1000 into a GIC which will triple evry three years. How many years will pass before they have the same amount of money?

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Tutor can you help me with this equation please?

I need to simplify this expression.

15x^2-x-2/3x^2-5x-2
one angle is angle x, and another is the right angle (90�). Since the angles in a triangle add up to 180�, the other angle will be 90-x. For the unlabeled angle above, the angle 90