A student is involved in a Read-A-Thon fundraising event. She got people to donate a certain amount for each book she read.
Three people pledged $0.50 per book. Five people pledged $1.00 per book. Eight people pledged
$0.75 per book. She wants to raise $75 for charity.
Write and solve an equation to find out how many books she will need to read to meet her goal.
Don't include dollar signs in your expressions or equation.