exam Maths Puzzle Numerical Ability

solve for x

-4( 8
_________)^-1 = 1/8
-3x + 5

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exam Other Question

interest is compounded semiannually. Find the amount in the account after the given time:
Principal Rate of interest Time
$2000 5% 3 years Please can you help me solve x

(((3 + 3/x = 7)))

Thank you