book Maths Puzzle Numerical Ability

X=2.1+2.7+y

Need the real numbers for X and Y

Thank you!:-)

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book Other Question

Is -5 a solution to the equation 9-8x=49 Solve the quadratic equation by factoring and applying the property "ab=0 if and only if a=0 or b=0"

(x^2)+3kx-(10k^2)=0