$5.$ If a field requires an application of $25$ kg of phosphorus, and the farmer decides to use monoammonium phosphate $($MAP$)$ which contains $55\%$ phosphorus pentoxide $($P$$O$),$ how much MAP should be applied to the field?

$6.$ A certain crop requires an application of $40$ kg of potassium per hectare. If potassium chloride $($KCl$)$ is used and it contains $60\%$ potassium, how much of this fertilizer should be applied?