What is the ratio of the number of boys in School C in the year 2009 to the number of girls in School A in the year 2009 ?

Answer: Option C

(Number of boys in C in 2009) : (Number of girls in A in 2009)
$$\begin{array}{rl}& =\left(8.7\times 100\right):\left(12.9\times 100\right)\\ & =\frac{870}{1290}\\ & =\frac{29}{43}\\ & =29:43\end{array}$$