Word Problems on HCF and LCM

A boy saves $₹ 4.65$ daily. Find the least number of days in which he will be able to save an exact number of rupees.

Find the largest number that divides $1386, 1458$ and $1629$ leaving $6, 3$ and $9$ as remainders respectively.
 

Find the largest number that divides $246$ and $1030$ leaving $6$ as remainder in each case. 
 

Four bells ring at intervals of $8, 12, 18$ and $20$ minutes respectively. At what time will they all ring together if they start ringing simultaneously at $12$ noon?