Quote:
Originally Posted by dreamcatcher
4x+2y=100
x+y=30
x=y-30
4(y-30)+2y=100
120-2y=100
y=10
x+10=30
x=20
So 20 cows and 10 hens
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Dont just go for equations
, just use ur brain
For cows or hens, there will be 2 legs in common. There are 100 legs in total and there are 30 in number. Hence 30 x 2 = 60 legs are common.
But the extra 40 (100 - 60) legs are nothing but cows' legs.
Since each cow has 2 extra legs,
40/2 = 20 cows
rest (30-20) 10 are hens...That's all !!!
Quote:
Originally Posted by nvidia
-1 = √1
-1 = 1
Why does this happen? |
√1 can be (-1)^2 or (1)^2 so u cannot say that √1 is 1
