Answer:
Step-by-step explanation:suppose thumb drives can be represented by d
suppose CD's can be represented by c
according to given condition:
4d+1c=9gb---->(1)
&
5d-9=1c--->(2)
add both the equations:
4d+1c=9
5d-1c=9
------------
9d=18gb
t=2gb
now put t=2gb in 2nd equation
5(2)-9=1c
10-9=1c
1gb=1c
so from the results we can say that each thumb can hold 2gb and each CD can hold 1gb.