Total weight of student in Section A =40×45.5=1820kg Total weight of students in Section B =40×442=1768kg Weight of two students of Section A shifted to B=48.75×2=97.50kg Now, students weight in A=1820−97.50=1722.5kg and student weight in Section B =1768+97.50⇒1865.5kg According to the question, 1865.5−2x=1722.5+2x ⇒4x=1865.5−1722.5 ⇒4x=143 ⇒x=35.75 So, the average weight of student shifted to A from B=