exam Maths Puzzle Numerical Ability

Need to come up with an answer of either 21 or 45.

3^2 / 1/3 + 3 x 6 = ?

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exam Other Question

keep getting stuck on this one
Use synthetic division to divide (x^3+8x^2+21x+20) / (x+4).
thanks for your help I just had a question

Is it true that when constructing the median of a triangle, it is possible that the median may lie exterior to the triangle?