exam Maths Puzzle Numerical Ability

points M, N, and X are collinear and X is between M and N. If MN=20 and the ratio between MX and NX is 2:3 what is the length of NX? I divid them into eachother

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exam Other Question

solve the system by addition method. if a unique solution doesn't exist, state whether the system is inconsistent or dependent.
x+8y=10
-x+y-2z=-3
3x-2y+5z=9 I need to know what the 1st and 2nd number in an ordered pair is . Can you help?