exam Maths Puzzle Numerical Ability



If three times a number added to 3 is divided by the number plus 11, the result is four thirds. Find the number?

HOw do I fo this and what is the answer?

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exam Other Question
Okay im not exactly sure what to do here.
The half-life of radon-222 is about 85 hours. What fraction of an intial amount of the material would be left afer 10 hours?

Thanks for the help! Can you show me differenet ways of converting metric units into other metric units or web site thank you