 
 <translate> Let A be the number of apples Ali ate and S be the number of apples Sara ate. We have: A + S = 80 apples. And: A = 4S. Which means: 4S + S = 80. So: 5S = 80. So the number of apples Sara ate is: S = 80 / 5 = 16 apples. So the final answer is 16. <ibo> Ka A bụrụ ọnụọgụgụ mkpụrụ osisi apụl Ali riri na S bụ ọnụọgụgụ mkpụrụ osisi apụl Sara riri. Anyị nwere: A + S = apụl 80. Na: A = 4S. Nke pụtara: 4S + S = 80. Ya mere: 5S = 80. N'ihi ya, ọnụ ọgụgụ apụl Sara riri bụ: S = 80 / 5 = apụl 16. Ya mere, azịza ikpeazụ bụ 16. 