exam Maths Puzzle Numerical Ability

I need help on problems involving adding and subtracting negitive and positive numbers.

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exam Other Question

The difference of two numbers is 6. Twice the smaller is4 more than the larger. Find the two numbers. amount of a radioactive tracer remaining after t days is given by A=A0e^-0.058t, where A0 is the starting amount at the beginning of the time period. how many days will it take for one half of the original amount of decay?