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A farmer owns a total of 20 ducks and lambs. The ducks and lambs have 64 legs altogether. How many lambs are there?

 Apr 17, 2021
 #1
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Let  the  number of lambs = N

 

Then the number of ducks   =  20 - N

 

So

 

No. of ducks x legs each  +  No. of lambs x legs  each =   64        .....so....

 

(20 -N) * 2   +   N ( 4)  = 68                simplify

 

40 - 2N  + 4N  =  68

 

2N  =  68 - 40

 

2N  =  28

 

N = 28 /  2   =   14  lambs  

 

 

cool cool cool

 Apr 17, 2021

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