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

[EX Q]: Problem: the reciprocal of the hcf and lcm of two are 1 / 13 and 1 / 312 . if one of the number is 24 then other no . is
Options: a ) 126 , b ) 136 , c ) 146 , d ) 156 , e ) 169
[EX A]: e

[EX Q]: Problem: joe needs to paint all the airplane hangars at the airport , so he buys 360 gallons of paint to do the job . during the first week , he uses 1 / 4 of all the paint . during the second week , he uses 1 / 4 of the remaining paint . how many gallons of paint has joe used ?
Options: a ) 18 , b ) 157 , c ) 175 , d ) 216 , e ) 250
[EX A]: b

[EX Q]: Problem: the food in a camp lasts for 10 men for 20 days . if 30 more men join , how many days will the food last ?
Options: a ) 8 days , b ) 4 days , c ) 5 days , d ) 10 days , e ) 17 days
[EX A]:
c