exam Maths Puzzle Numerical Ability

Solve.

t/3 - 3/t = 0

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exam Other Question

I THINK that this is a linear equation problem. Can you help me solve this? I don't know how to solve for multiple variables in this way:
{{{2x+2z=2}}}

{{{5x+3y=4}}}

{{{3
If there is a plot of land that is 24 by 30. And surrounding the land is a walkway that has an area of 247 ft. sq. what is the width of the walkway.