lizarroyo
11.07.2019 •
Mathematics
Tiffany sold 4 painting in 3.5 months
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Ответ:
Ответ:
Ответ:
then distance ran = 25x and distance walked = 5y
so 15x + 5y = 42
and x + y = 4
* second equn. by -5:-
-5x - 5y = -20
add this to the first equn:0
10x = 22
x = 2.2
distance she ran = 2.2 * 15 = 33 km