exam Maths Puzzle Numerical Ability

11. a(rs)8- 3(rs)2a^2

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exam Other Question

I am severely stuck getting my head around this one. The question says: Find the base number. It then goes on to say: Solar panels provide 65% of the heating for a certain building Please help!

the 4th root of 3s^2t^4 (numerator)
10,000 (denominator)

I don't even know where to begin.