exam Maths Puzzle Numerical Ability

Find the area of an equilateral triangle with a apothem 3.5 meters long and each side 12 meters long

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exam Other Question

Solve the following system of equations

x+2y-6=z
3y-2z=7
4+3x=2y-5z 1) 1/A=1/M+1/T solve for T
I thought my LCD was AMT but its still not coming out right.
If someone could help thanks.