Answer :
Given : Sandeep donated 75 glucose biscuits and 45 monaco biscuits .
To find the least number of packets which can be made for the two types , We find H.C.F. of 75 and 45 :
75 = 3 5 5
And
45 = 3 3 5
So,
H.C.F. ( 75 and 45 ) = 3 5 = 15
So,
the number of biscuits in each packet = 15
And
Total least number of packet = = 8 ( Ans )