In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: an amount of rs . 3120 was divided among a , b and c , in the ratio 1 / 2 : 1 / 3 : 1 / 4 . find the share of c ? 
Options: a ) 720 , b ) 360 , c ) 250 , d ) 280 , e ) 290
a

Problem: if | 5 x - 5 | = 150 , what is the sum of all the possible values of x ? 
Options: a ) 2 , b ) - 2 , c ) 6 , d ) - 3 , e ) 5
a

Problem: what is the least number to be added to 661 to make it a perfect square ? 
Options: a ) 13 , b ) 15 , c ) 20 , d ) 16 , e ) 45

b