Question

What is 5℅of15%of80:

Answer 1

To get the solution, we are looking for, we need to point out what we know. 

1. We assume, that the number 80 is 100% - because it's the output value of the task. 
2. We assume, that x is the value we are looking for. 
3. If 80 is 100%, so we can write it down as 80=100%. 
4. We know, that x is 15% of the output value, so we can write it down as x=15%. 
5. Now we have two simple equations:
1) 80=100%
2) x=15%
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
80/x=100%/15%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.
7. Solution for what is 15% of 80

80/x=100/15
(80/x)*x=(100/15)*x       - we multiply both sides of the equation by x
80=6.66666666667*x       - we divide both sides of the equation by (6.66666666667) to get x
80/6.66666666667=x 
12=x 
x=12

now we have: 
15% of 80=12

Answer 2

Hi friend
5/100*15/100*80
5/100*15/5*4
5/100*60/5
After simply the answer is3/5