Answer:
I think that the answer is D (13,20)
Answer:
The tank is 10cm high
Step-by-step explanation:
Given
-- length
-- width
--- water lever

Required
The height of the tank
Let y represents the remaining fraction before water is added.
So:

Make y the subject


Solve


Represent the volume of the tank with v
So:

Make v the subject

Substitute: 


Represent the height of the tank with h;
So, the volume of the tank is:

Make h the subject

Substitute values for v, l and w

Convert 30L to cm^3



There would be 10 mens out of the 20 because since 5 is a half of 10 then u could predict that there is a half of people that are mens in the 20 people.
Answer:
n<4
Step-by-step explanation:
4n-5<-9n+47
13n<52 |:13
n<4