exam Maths Puzzle Numerical Ability

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n + 5 3/10=8 1/10, find the value of n.

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exam Other Question

Solve. x^2 + 8x + 15 = 0
The amount of a radioactive tracer after t days is given by A=A lower case o e^-0.18t, where A is the starting amount at the beginning of the time period. How much should be acquired now to have 40 grams remaining after 3 days?