Bunuel
Country ---Amount Recycled---------Amount Disposed of
A------------16,700-------------------- 142,800
B-------------8,800----------------------48,000
C------------13,000----------------------51,400
D-------------3,900----------------------20,300
E-------------3,300----------------------16,200
The table above shows the amount of waste material, in tons, recycled by each of five counties in a single year and the amount of waste material, also in tons, that was disposed of in landfills by the five counties in that year. Which county had the lowest ratio of waste material disposed of to waste material recycled in the year reported in the table?
A. A
B. B
C. C
D. D
E. E
Question asks to determine lowest ratio of amount disposed / amount recycled.
(A) 142,800 / 16,700 = ~ 8 - 9
(B) 48,000 / 8,800 = ~ 6
(C) 51,400 / 13,000 = ~4
(D) 20,300 / 3,900 = ~ 5
(E) 16,200 / 3,300 = ~ 5
Answer: C.
My advice is before doing calculations estimate the numbers and start with the easiest. No need for exact numerical values, so good approximation will work in this case.
Bunuel when all can we take approximations? Because I have tried using this method but it gives different answer. How much and when to estimate?