Question

solve both the questions...
do not copy from google..

Answer 1

the answer is 36 students

rows be x and the students in each row y
(y+3) (x-1) = xy
xy + 3x - y = xy
3x - y = 3-6........ (1)
(y-3) (x+2) = xy
xy - 3x + 2y = 6..... (2)

3x - y = 3
-3x + 2y = 6
subtracting
y = 9

3x - 9 = 3
3x = 12
x = 12/3 = 4

no. of students = xy
= 9 x 4

ans 16.. Let the number of cows be x and the number of hens be y.
Then, 4x + 2y = 2 (x + y) + 14 ⇔ 4x + 2y = 2x + 2y + 14 ⇔ 2x = 14 ⇔ x = 7.

hope this helps

Answer 2

let the no of heads=y,no of cows =X,..no of chicken is =y-x ,,,now
$according \: to \: the \: question \\ 2(y - x) + 4x = 14 + 2y \\ 2y - 2x + 4x = 14 + 2y \\ 2y + 2x = 14 + 2y \\ 2x = 14 + 2y - 2y \\ 2x = 14 \\ x = 7 \\ (so \: the \: no \: of \: cow \: is \: 7 \: \: \: thanks)$
after that you are brainalist.....