Để chuẩn bị cho năm học mới, bạn Minh đến một cửa hàng để mua vở và bút. Hôm đó, cửa hàng mừng khai trương nên giảm giá 10% cho vở vị 15% cho bú. Vì vậy, tổng số tiến vở và bút mà Minh đã trả là 176 nghìn đồng. Chị bản hàng cho biết, nếu cửa hàng không giảm giả thì tổng số tiền mà Minh phái trả sẽ là 200 nghìn đồng. Em hãy tim số tiền mua vở, số tiền mua bút mà Minh phải trả nếu cửa hàng không giảm giá.

XI. Read the passage carefully, then do the tasks. GIẢI THÍCH GIÚP MÌNH NHÉ

Scientists say it could take at least 1,500 years before humans make contact with species of aliens, or for them to communicate with or find us. Astronomers from Cornell University in the USA combined two existing theories about the possibility of life existing on other planets to form a new equation. One of these theories is the Fermi Paradox described by physicist Enrico Fermi in 1950. This States that while billlons of Earth-like planets exist in our galaxy, not One has made contact with Earth yet. The other is the principle, which suggests that because there is life on Earth, it will typically exist on Earth-like planets throughout the universe. We havent heard from aliens yet, as space is a big place, but that doesnt mean no one is out there, study author and Cornell astronomy student Evan Solomonides said. According to Solomonides, extraterrestrials could have received signals from Earth. However, he suggests that ET would not have been able to decode them. He said they would need to decode the light waves into sounds and analyse 3,000 human languages to understand any messages. He said that signals from Earth have only reached about 8,500 stars and that the Milky Way galaxy alone contains 200 billion stars. He added: If we stop listening or looking, we may miss the signals, so we should keep looking.

1. How many years might it be before we make contact with aliens?
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2. What university are the researchers from?
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3. When did the Italian physicist Enrico Fermi describe his theory?
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4. Who is Evan Solomonides?
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5. What did Evan Solomonides say about space?
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6. What will extraterrestrials need to do to understand human messages?
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7. What contains 200 billion stars?
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