y = (99-2x)/5
x = .....,-3 ,2, 7, 12....
x,y = (2,19)...(7,17),
Here, AP is formed with alternate coefficients like this
(7+5k, 17-2k) ..
We want x > y so
7 + 5k > 17 - 2k k ~ 1+ =~ 2
(17,13)
Now y will decrease with gap of 2 and we need it to be y ≥ - 20
Minimum possible = - 19
This will give us number of possibilities..
a =13..... d = -2 an = -19
-19 = 13 + (n-1)-2
n = 17
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