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

Problem: 120 kg of an alloy a is mixed with 180 kg of alloy b . if alloy a has lead and tin in the ratio 2 : 3 and alloy b has tin and copper in the ratio 3 : 5 , then the amount of tin in the new alloy is ? 
Options: a ) 100.6 kg , b ) 120.3 kg , c ) 139.5 kg , d ) 140.8 kg , e ) 114.5 kg
c

Problem: 9 log 9 ( 6 ) = ? 
Options: a ) 1 , b ) 6 , c ) 3 , d ) 4 , e ) 5
b

Problem: sachin is younger than rahul by 5 years . if the ratio of their ages is 7 : 9 , find the age of sachin 
Options: a ) 24.58 , b ) 24.5 , c ) 24.3 , d ) 24.9 , e ) 15.5

e