SOLUTION: word problems-quadratic equation Students sent flowers costing $20 to a sick classmate. There were four fewer students contributing than was planned, requiring each of the others

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Question 105856: word problems-quadratic equation
Students sent flowers costing $20 to a sick classmate. There were four fewer students contributing than was planned, requiring each of the others to give 25 cents more. How many students contributed to the gift?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x="students contributing"

20%2Fx=%2820%2F%28x%2B4%29%29%2B1%2F4 ... 20*4*(x+4)=20*4*x+x*(x+4) ... 80x+320=80x+x^2+4x

0=x^2+4x-320 ... hint: should factor nicely