exam Maths Puzzle Numerical Ability

i hope that you can help me solve this one. thanks.
find all real solutions of the equation.
3squareroot3x+1endsqroot -5=0

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exam Other Question

One angle of a triangle is twice as large as the smallest angle. The measure of the third angle is 20 more than that of the smallest angle. Find the measure of the smallest angle. How many strands of wire are needed to over an area measuring 9m*4.5m 5 strands high?