When processing flower-nectar into honeybees' extract, a considerable amount of water gets reduced. How much flower-nectar must be processed to yield 1kg of honey, if nectar contains $50%$ water, and the honey obtained from this nectar contains $15%$ water?
In honey this non-water part constitutes $85\% (100-15)$.
Therefore $0.5X$ Amount of flower-nectar = $0.85X$ Amount of honey = $0.85\times 1$ kg
Therefore amount of flower-nectar needed
Moderate Percentages Question - 5
$30\%$ of the men are more than 25 years old and $80\%$ of the men are less than or equal to 50 years old. $20\%$ of all men play football. If $20\%$ of the men above the age of 50 play football, what percentage of the football players are less than or equal to 50 years?