Question 25577
Let number of $35 tickets be "x"
The number of $50 tickets is "25000-x"
Value of $35 tickets is 35x
Value of $50 tickets is 50(25000-x)=1,250,000-50x
INEQUALITY:
 Value of 35 + Value of 50 >= 1,025,000
35x+1,250,000-50x>=1,025,000
         -15x >=-225,000
            x>=15,000 (number of $35 tickets sold)
    25000-x>=10,000(number of $50 tickets sold)
I'll leave it to you to shown that if you choose
a value of x>=15000 the inequality condition is met.

Cheers,
Stan H.