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Sia ? 4 years, 5 months ago
Let the number be n.
According to the question,
7n + 50 + 40 = 300
⇒ 7n + 90 = 300 ⇒ 7n = 300 − 90
⇒ 7n = 210 ⇒ n = 210/7
⇒ n = 30
Thus, the required number is 30.
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