exam Maths Puzzle Numerical Ability

My question is how to solve:
2x+1<3x<12

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exam Other Question

please simplify:

4 over ax+ay-bx-by minus 3 over a-b...all of this OVER

2 over a-b plus 2 over x^2 + xy

so it should look like:

4.....................3
-------- minus Use the formula C= 5/9 (F-32 degrees) to find the Celsius temperature that is equivalent to the 59 degrees Fahrenheit.