Elections |
Votes cast |
Votes not cast |

NGE |
260,000 - 1.25x |
1.25x |

AP |
260,000 - x |
x |

From the given conditions,

$(260,000 - 1.25x) - 1.25x = 2(x - (260,000 - x ))$

$\implies 6.5x = 7,80,000$

$\implies x = 1,20,000$

So, number of people voted for the Praja Party in the Assembly Elections $= 2,60,000 - 1,20,000 = 1,40,000$