7/11 (f+380) = f + 4/11 (f+380) + 20
now just solve for f
Ethan had 380 more building blocks than Fiona. After Ethan had given 4/11 of his building blocks to Fiona, he still had 20 more building blocks than Fiona. How many building blocks did Fiona have at first?
2 answers
115 blocks