Answer :

Let 500 notes be x

Let 1000 notes be y


According to the question


x + y = 175(i)


According to the question


500x + 1000y = 100000(ii)


500(x + 2y) = 100000


x + 2y = 20


subtrate (i)-(ii)


x + y-x-2y = 175-200


y = 25


Putting the value of y in (i)


x + y = 175


x = 175-25


x = 150


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