book Maths Puzzle Numerical Ability

Hi!
I tried to solve this problem but my answer came out in the form of a fraction. I think I am doing it the wrong way. Please show me how to solve this system using substitution

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In simplest radical form what is 3 to the square root of 13/3 Members of a marching band are making there own color-guard flags. Each flag is 1.2 yards by 0.5 yard. The material costs $1.75 per square yard. How can i write a function showing