If x : y : z  = 2: 3: 4, evaluate $\frac{9x+3y}{6z-2y}$

If $y-2x=4$and $y-3x=-1$, find the value of $(x-y)$

If $F=\frac{9}{5}C+32$, find C when F =98.6

If ${{\log }_{10}}(6x-4)-{{\log }_{10}}2=1$, solve for x

There are 250 boys and 150 girls in a school. If 60% of the boys and 40% of the girls play football, what percentage of the school plays football?

Simplify $2\tfrac{1}{4}\times 3\tfrac{1}{2}\div 4\tfrac{3}{8}$

Find the value of x for which 32_four = 22_x

Given that y varies inversely as the square of x. If x =3 when y =200. Find the equation connecting x and y

Evaluate ${{\left( {{64}^{\tfrac{1}{2}}}+{{125}^{\tfrac{1}{3}}} \right)}^{2}}$

Simplify: $\sqrt{108}+\sqrt{125}-\sqrt{75}$