exam Maths Puzzle Numerical Ability

Please help me solve for x and z for this equation: {{{ 2x+4y+10z=10 }}} {{{ -8x-16y+5z=-13 }}} {{{ 16y-20z=2 }}}}

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exam Other Question

the circumference of a circle is 6 pie meters. find the radius of the circle A "simple square" is any integer greater than 1 that has only three positive integer factors -- itself, its square root, and 1. Which of the following is a simple square?

(A) 12