don't be rushed
Algebra
Level
1
In a horse race, a child looked under the stable door and saw 74 feet. He looked over the stable door and counted 22 heads. Given that there are only horses and knights in the stable, how many horses are there?
The answer is 15.
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1 solution
Let knight be k and horses be h then
k+h=22 (heads) and 2k+4h=74 (foots) solving these we have h=15