Rewrite the question, as follows:
45 is what percent of 225?
Form the ratio 45/225, and then multiply the result by 100%:
0.20(100%) = 20% (answer)
I set it up as a ratio with hours on the top and the fraction of the job on the bottom. It looks like this: 5/(2/3) / x/1, because 1 is the whole job if 2/3 is only a fraction of it. Cross multiplying gives you 2/3x = 5. Solving for x gives you that it will take 7.5 hours to complete a whole job if it takes 5 hours to complete 2/3 of it.
There is a lack of a diagram to go along with this question...
Answer:
Step-by-step explanation:
Surface area → area of 2 bases + area of 6 rectangles
Area of base is given
Area of rectangle → length × width
