exam Maths Puzzle Numerical Ability

How do you find proportion

example

Which of these is the correct proportion
72:24=8:3 WRONG
36:48=2:3 WRONG
2:5= 30:75 CORRECT
9:7= 81:54 WRONG

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exam Other Question

I was doing great until I ran into this one please help!

Find all positive values for k for which each of the following can be factored

x^2 + 5x + k

Thank you very much! Please find the value of the expression 4P4