dumbdumbkylee
07.10.2019 •
Mathematics
Acar dealership sells used cars for$7,000 and new cars for$1,600. if a total of 17 cars were sold for $191,000. how many of the cars sold were used?
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Ответ:
(1) x + y = 17
(2) 7000x + 16000y = 191000
Solving these equations simultaneously:
x = 17 - y (1)
7000x + 16000y = 191000 (2)
7000(17-y) + 16000y = 191000
y = 8 new cars
Then, substituting this to equation 1,
x = 17 - 8 = 9 used cars
Ответ:
3/16+4/16+4/16=11/16
16/16-11/16=5/16