Question

(270/y-2)*30=840 какой ответ​

Answer 1

$( \frac{270}{y} - 2) \times 30 = 840 \\ \\ \frac{8100}{y} - 60 = 840 \\ \\ \frac{8100}{y} = 840 + 60 \\ \\ \frac{8100}{y} = 900 \\ \\ 900y = 8100 \\ \\ y = 8100 \div 900 \\ \\ y = 9$

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