Question

plez help me in solving this question its urgent

Answer 1

marks of maths be x
marks of science be y
x+y = 28
y = 28-x
(x+3)(y-4) = 180
(x+3)( 24-x) = 180
x^2-21x-72
x^2-24x+3x-72
x(x-24)+3(x-24)
so, x = 24 and -3