exam Maths Puzzle Numerical Ability

how to solve 2/3 + X/5 < 4/15

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How many ounces of pure gold must be added to five ounces of something that is 1 % gold in order that the mixture is 6 % gold? Please show me how to find the least common denominator on my homework question. thank you

t^27t+12, t^2-4t, t.

The choices are. what is the answer and how do I go about fi