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svetlana [45]
3 years ago
12

90 + 90 ÷ 90 = _________​

Mathematics
1 answer:
Karolina [17]3 years ago
6 0

Answer:

91

Step-by-step explanation:

this is correct answer

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Ginger wants to fill her new swimming pool. She has two pumps; the larger pump takes 40 minutes to fill the pool, and the smalle
Talja [164]

As per the problem,

The larger pump takes 40 minutes to fill the pool.

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When both the pumps are working , let the time taken be x minutes , then we can write

\frac{1}{x}=\frac{1}{40}+\frac{1}{60}\\ \\ \text{Make the denominator equal we get}\\ \\    \frac{1}{x}=\frac{1}{40}*\frac{60}{60}+\frac{1}{60}*\frac{40}{40}\\ \\   \frac{1}{x}=\frac{60}{2400}+\frac{40}{24000}\\ \\   \text{Simplify we get}\\ \\ \frac{1}{x}=\frac{60+40}{2400}\\ \\ \frac{1}{x}=\frac{100}{2400}\\ \\ \frac{1}{x}=\frac{1}{24}\\ \\ x=24\\

Hence, when both the pumps works together, Time taken =24 minutes.

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3 years ago
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Sergeeva-Olga [200]

Answer:

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Use the formula C=πd

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You then get 62.8318530718 in a calculator

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2 years ago
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Free_Kalibri [48]
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