dondre54
02.11.2019 •
Mathematics
2.5x + y = 10.7
2.5x + 2y = 12.9
its elimination
Solved
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Ответ:
9514 1404 393
76.6
Step-by-step explanation:
The number remaining (72) after the 6% decrease is 94% of the original value (x). Then ...
72 = 0.94x
72/0.94 = x ≈ 76.6
The original number is about 76.6.