Answer:
The work will be finished in 10 days.
Step-by-step explanation:
Rashid can do a piece of work in 8 days
This means that each day he works, Rashid does
of the work.
Tipu can finish in 12 days.
This means that each day he works, Tipu does
of the work.
Each 2 days:
Each 2 days they work, the amount done is given by:

Each 2 days, 5/24 of the work is done:
The number of periods of 2 days that is needed to finish the work(100% = 1 completed), is given by:

2*4.8 = 9.6
Rounding up
The work will be finished in 10 days.
You have to do what it says if you have to divide you divide if you have to multiply you multiply if you have to add you add and that is the same for subtraction as well.
I hope this helps you out.
Step-by-step explanation:
This would be 6C3
= 6*5*4
---------- = 20 answer
3*2*1
-x^2 + 4 = 2x + 1
-x^2 - 2x + 4 - 1 = 0
-x^2 - 2x + 3 = 0
(x + 3)(-x + 1)= 0
x + 3 = 0 -x + 1 = 0
x = -3 -x = -1
x = 1
so x = -3 and x = 1