OK PRAKASH JI... U NEED TO READ THE QUESTION ONCE AGAIN.... U R COMPLETELY WRONG.. .CAS IT HAS TO BE AN INTEGER... NO RATIONAL OR DECIMAL NO.S ACCEPTED... OK MY ANSWER FOR U IS 12 AND 24....
CAS 24 IS DOUBLE OF 12 AND...
AND 2 IS DOUBLE OF 1 IN 12
WHERE AS 4 IS DOUBLE OF 2 IN 24