In this task, you need to answer the given multiple-choice question on the gain. Gain is the value by which to multiply the input. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: how many liters of water must be evaporated from 50 liters of a 8 - percent sugar solution to get a 10 - percent solution ? 
Options: a ) 8 , b ) 10 , c ) 12 , d ) 14 , e ) 16
[EX A]: b

[EX Q]: Problem: a man walking at a rate of 15 km / hr crosses a bridge in 10 minutes . the length of the bridge is ? 
Options: a ) 500 m , b ) 1110 m , c ) 950 m , d ) 1000 m , e ) 1300 m
[EX A]: a

[EX Q]: Problem: in an election only two candidates contested . a candidate secured 70 % of the valid votes and won by a majority of 178 votes . find the total number of valid votes ? 
Options: a ) 445 , b ) 570 , c ) 480 , d ) 520 , e ) 550
[EX A]:
a