From s stationery shop sudhi bought two books of mathematics and 3 books of physics for rs 850 and dukan bought 3 books of mathematics and 2 books of physics for rs 900 find price of 1 mathematics book and 1 physics book

let mathematics book be x and physics book be y
According to the first condition:
2x+3y=850          *3
According to the second condition:
3x+2y=900          *2
Equating both conditions, we get
6x+9y=2550       (i)
6x+4y=1800       (ii)
subtracting ii from i, we get
5y=750 =>
y=150
x = 3x + 2*150=900
3x=900-300
x=200