Asia has the highest number of child workers, but Sub-Saharan Africa has the highest proportion of working children relative to population.
There are more children in Asia than there are in Sub-Saharan Africa.
That is probably true, but statement says only obout working children. 
( z1 have-quant :ARG1 ( z2 child :location ( z3 continent :name ( z4 name :op "Asia" ) ) ) :ARG3 ( z5 more ) :ARG4 ( z6 child :location ( z7 world-region :name ( z8 name :op "Sub-Saharan" :op "Africa" ) ) ) )