book Maths Puzzle Numerical Ability

If a,b,c are in Arithmetic progression and a^2,b^2,c^2 are in Harmonic progression then what is the relation connecting a,b,c?

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book Other Question

Solve and check the equation 6 - (-5r) = 5r - 3 If m varies directly as n and inversly as o, and m=20 when n=50 and o=10, find m when n=96 and o=16.
m=____
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