Question 628564
Let
Total Rs. 10 = x notes
Total Rs. 20 =50-x
Total Number of Notes = 50
Total sum of all notes = 800

(10)(x)+(50-x)(20)=800
10x+1000-20x=800
-10x=800-1000
-10x=-200
Divide by -10
-10x/-10=-200/10
x=20


Total Rs. 10 = x = 20  notes
Total Rs. 20 =50-x = 50-20 = 30 notes