Question

question no.7 plss urgent​

Answer 1

arithmetic progression ka question lagta h formula apply kar nd u will get the answer

Answer 2

Let x be number of students in a row

let y be number of rows

Therefore x*y is = total number of students

(x-10)(y+3)=xy

on simplification

3x-10y=30

second equation

(x+10)(y-2)=xy

on simplification

-2x+10y=20

Using elimination method

we get x=50

y=12