exam Maths Puzzle Numerical Ability

3
____
4b-9

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exam Other Question

While working for a construction company, you realize that the cost of building a high-rise apartment varies from floor to floor according to an arthimetic progression. You calcula I got one more that is giving me problems! HELP PLEASE!! THANK YOU!

(2x/2x)(3x/5x)
/=the radical sign

Thanks in advance!
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