exam Maths Puzzle Numerical Ability

13.9 multiply 3.2=

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exam Other Question

Simplify each complex fraction.

1/3 + 1/y / y/3 = 3/y

and

ab+b^2/4ab^5 / a+b/6a^2b^4 Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n