Answer:
p = 0.299
Step-by-step explanation:
A proportion is the number of desired outcomes divided by the number of total outcomes.
Desired outcomes:
We want to estimate the proportion of oil tankers that had spills. Of the 1453, 1018 did not have spills, and 1453 - 1018 = 435 had. So 
Total outcomes:
All the 1453 tankers, so 
Estimating the proportion

Answer: 32 kilograms
Step-by-step explanation:
Cross multiply and divide.
20/5
x/8
The answer should be 32.
You seem to want a ratio.
If that's the case:
18 in 1 ft
------- * --------- = 3/8 = 0.375
4 ft 12 in