Number of students studying in class X from school P forms approximately what percent of the total number of students studying in class X from all schools together?

Total number of students of class X from all school = Total number of students of class X of ( School P + School Q + School R + School S + School T + School U)
Total number of students of class X from all school = 144 + 143 + 165 + 168 + 150 + 140 = 910
Required percentage = Total number of students of class X of school P x 100/Total number of students of class X from all school
Required percentage =144 x 100/910 = 15.82 ≈ 16%