exam Maths Puzzle Numerical Ability

If you deposit money today into an account that pays 6.5% interest, how long will it take for you to double your money?

I am having difficulty figuring this out and need some help to solve this problem. Thanks

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exam Other Question

Given:
angle 3 is complementary to angle 1
angle 2 is complementary to angle 1
angle 4 is congruent to angle 5
Prove:
angle COM is congruent to angle PMO
At what points does the line 4x + 12 = 3y cross the x and y axes?