Answer:
8
Step-by-step explanation:
x - 3 = 5
x = 5 + 3
x = 8
Therefore, the number is 8.
The calculation: 4kg-2.3kg = 1.7 kg
The crate weighs 1.7 kg
So you can set up proportion.

Here, you need to solve for C.
You can do that by multiple both sides by 360 and then you should get

Hope this helps.
X is less than or equal 18. I hope it helps