Task: Question Answering
Input (English): Problem: how many kilograms of sugar costing rs . 9 per kg must be mixed with 27 kg of sugar costing rs . 7 per kg so that there may be gain of 10 % by selling the mixture at rs . 9.24 per kg ? 
Options: a ) 60 kg , b ) 63 kg , c ) 50 kg , d ) 77 kg , e ) none of these
Output (English): b