exam Maths Puzzle Numerical Ability

Can someone please help me to answer this question showing the step-by-step process of how to find the answer? I appreciate the help. This did not come from a book so there is no

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exam Other Question

HELP!
please explain to me and help w/ this problem::
x/2 + x/4 =5

and this:
25x/5 - 7x= 12
sec.4.4

Directions: determine whether each of the following trinomials is a perfect square. If it is, factor the trinomial.

#48

x^2-24x+48

#54

16x^2+40xy+25y^2