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18.03.2021 •
Mathematics
Do the ratios 19/12 and 5/4 from a proportion
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Ответ:
n=9
step-by-step explanation:
7 times a number = 7n
decreased by 13 = 7n-13
same as is =
5 times the number = 5n
increased by 5 = 5n+5
7n-13 = 5n+5
2n=18
n=9