10 is the answer
Answer:
20%
Step-by-step explanation:
2.5 min =(60×2.5)sec=150 sec
30sec to 150sec=30×100/150=20%
x=2
2x+4=4x
-2x -2x
4=2x/2x
4/2=x
4/5
9x+1=5
or, 9x=5-1
or, 9x=4
therefore x=4/5
