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justaguy15
02.08.2019 •
Mathematics
Jordan count 28 legs on 8 animals if the animals are either zebras or pecocks how many zabras are there
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Ответ:
Let
Z=number of zebras (4 legged)
P=number peacocks (2 legged).
We know that
P=8-Z (total of 8 animals)
and
4Z+2P=4Z+2(8-Z)=28
expand and solve for Z
4Z+16-2Z=28
2Z=12
Z=6 There are 6 zebras.
Another way to solve, without pen and paper:
if all are zebras, there are 4*8=32 legs, or 4 legs too many.
Each exchange with a peacock reduces 2 legs, so we exchange 2 zebras with 2 peacocks to get 6 zebras.
Ответ:
Jeremy drove 240 miles in 5 hours