Sanjay decided to do his history homework a little each night
MATHEMATICS · Numerical · AoPS · Mathematics · x Marks the Spot · x Marks the Spot
Problem
Sanjay decided to do his history homework a little each night. On the first night, he did 61 of the homework; on the second night, he completed 51; and on the third night, he worked on 21 of the homework. How much of the homework has Sanjay completed?