exam Maths Puzzle Numerical Ability

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

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exam Other Question

Write each of the following ratios in simplist form

The ratio of 5 3/5 to 2 1/10




The ratio of 7 dimes to 3 quarters
Solve.

t/3 - 3/t = 0