LogFAQs > #909097880

Magus 10 posted...

wolfy42 posted...

If you have some girls with red hair, and some girls with black hair, with a total of 30 girls, and you have 5 times as many girls with black hair as red. Then 2 of the red haired girls dye their hair light blue, how many red haired girls do you have left?

r + b = 30
5r = b

r + 5r = 30
6r = 30
r = 30/6
r = 5

b = 30 - r
b = 30 - 5
b = 25

So, before the hair dye, you have 5 with red hair and 25 with black hair.

Finally, after two dye their hair, you have 3 with red hair, 25 with black hair and 2 with green hair.

I was giving a girl problem to Doctor Fox, but you are correct.
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