1. x+y=3 and y/x=2

or y=2x

so

x+2x=3
3x=3
x=1
so
y=2

2. Lets that number is x
so
x/2-4=6
x/2=6+4
x=2(10)
x=20

3. karachi to nawabshah=250
karachi to kotri=120
so % of distance=120/250*100=48

4. Number of shirts i.e. 8t=18
so one t shirt time = 18/8=2.25minutes
so xt=180 as 3 hours = 180min
2.25x=180
x=180/2.25=80

5. This is done by method of elimination as
T bill=tresury bill
FIB=federal investment bonds
PIB=pakistan investment bond
TFC=term finance certificate

so only thing we dont know remains DSG, so in my opinion it is DSG. But one word of caution as TFC are also issued by private corporations, so not much sure about it.

Regards