exam Maths Puzzle Numerical Ability

Can someone help me solve this problem?

25/2 . 4/5

Thanks,
Sher

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exam Other Question

Points R, S, and T are collinear, with point S between points R and T. If RT = 30, and ST = 2x + 4, what is the possible range of values for x? Determine whether each of the following is a trinomial square.
1. x^2-14x + 49
2. x^2-10x - 25
3. 36x^2-24x+16
4. 16x^2-40xy+25y^2
5. 9x^2 - 36x + 24

Can someone please help? Thank you!!