In this task, you need to provide the correct option for a given problem from the provided options.

[EX Q]: Problem: what is the square root of 625 , divided by 5 ?
Options: a ) 9 , b ) 36 , c ) 5 , d ) 6 , e ) 1
[EX A]: c

[EX Q]: Problem: 60 kg of an alloy a is mixed with 100 kg of alloy b . if alloy a has lead and tin in the ratio 3 : 2 and alloy b has tin and copper in the ratio 1 : 4 , then the amount of tin in the new alloy is ?
Options: a ) 24 kg , b ) 44 kg , c ) 20 kg , d ) 30 kg , e ) 52 kg
[EX A]: b

[EX Q]: Problem: in a certain school , the ratio of boys to girls is 5 to 13 . if there are 160 more girls than boys , how many boys are there ?
Options: a ) 100 , b ) 36 , c ) 45 , d ) 72 , e ) 117
[EX A]:
a