Bunuel wrote:
In a hair cut competition, the number of blonde girls is three times bigger than the number of brown haired girls, and the number of brown haired girls is twice the number of red haired girls. Assuming that there is no other hair color, what is the proportion of the brown haired girls?
A. 2/3.
B. 4/9.
C. 1/3.
D. 5/9.
E. 2/9.
We can let D = the number of blonde girls, W = the number of brown haired girls, and R = the number of red haired girls. We can create the equations:
D = 3W
and
W = 2R
W/2 = R
The proportion of brown haired girls is:
W/(W + 3W + W/2)
Multiplying by 2/2, we have:
2W/(2W + 6W + W) = 2W/9W = 2/9
Answer: E
_________________
5-star rated online GMAT quant
self study course
See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews
If you find one of my posts helpful, please take a moment to click on the "Kudos" button.