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Sheep

by harsh.champ » Fri Feb 19, 2010 7:43 am
How many ewes (female sheep) in a flock of 50 sheep are black?

1. There are 10 rams (male sheep) in the flock.
2. Forty percent of the animals are black.
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by thephoenix » Fri Feb 19, 2010 9:54 am
harsh.champ wrote:How many ewes (female sheep) in a flock of 50 sheep are black?

1. There are 10 rams (male sheep) in the flock.
2. Forty percent of the animals are black.
imo E

s1) gives no. of ewes=40 nothing else
insuff

s2)gives no. of black=20 and non black=30;nothing else
insuff

bth gives no.of r=10 and no. of e=40 and black=20 and non black=30 for this we have many solution for e+black
hence insuff

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by shashank.ism » Sun Feb 21, 2010 7:33 am
harsh.champ wrote:How many ewes (female sheep) in a flock of 50 sheep are black?

1. There are 10 rams (male sheep) in the flock.
2. Forty percent of the animals are black.
total no. of sheep = 50
St.1) no. of rams (male sheep) = 10 so ewes (female sheep) = 50-10 =40... but we don't know about the colour so Insuff...
St.2) 40% of animals are black so no. of black sheep = (40/100 ) x 50 = 20 sheeps are black but we don't how many of them are feamles or males... so Insuff...
combined) we know total black sheep = 20
total female sheep = 40
total male sheep = 10
but we don't how much of the female sheep are actually black....
though we know the percentage in total............insuff.

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