Question 552313
There were p pupils in the junior class and they decided to spend D dollars on a school project to which all would contribute equally. Then 20 students refused to donate. How much more did each of the rest of the students have to donate?


Since total contributions are D dollars, then at first each was supposed to contribute {{{D/p}}}


When 20 refused to donate, total contribution of D dollars remains the same, but the amount of students decreased by 20. Therefore, we have each now contributing: 


{{{D/(p - 20)}}}


This means that each would have to contribute: {{{D/(p - 20) - D/p}}}, or {{{(Dp - D(p - 20))/(p(p - 20))}}}, or {{{highlight_green(20D/(p^2 - 20p))}}} more


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