exam Maths Puzzle Numerical Ability

graph y=4

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exam Other Question

Simplify:
a) (2b^x)^2/(4b^3x-1)^-1
b) (x^-2 + y^-1)^-2
c) x^-2 - y^-2/ x^-1 - y^-1 One number is 6 less than another number. Their sum is 20. Find the greater number?