1: the perimeter of a circle is 15,7 dm. Its's area is...cm2

2: the ratio of the number of girls to the number of boys in a classroom is 5:4. When 10 girls left the classroom, the ratio of the number of boys to the number of girls became 4:3. How many students were in the classroom at first?

3: 47/250 dm3=...cm3

4: At the party 60% of the boys are dancing with 80% of the girls. How many people are dancing if there are 35 people ( A pair cludes only one boy and one girl)

5: An aquarium is 8dm deep, 12 dm long and 0,3 m wide. What is the volume of the aquarium in cubic centimeter?. Answer: the volume of the aquarium is...cm3

When people talk about Nha Trang, the biggest city in Khanh Hoa Province, they often think of a tropical paradise. Nha Trang is a famous seaside resort. It has a long coastline with beatiful white sandy beaches.

In the morning and afternoon, tourists can take part in various fascinating outdoor activities such as mud bathing, swimming, snorkeling or scuba diving. Snorkeling and scuba diving are both interesting sports, as swimmers may swim underwater and admire the lives at the bottom of the sea. Besides, tourist can also take boat trips to the islands. One of the most enjoyable trips is the trip to Mieu Island, where Tri Nguyen Aquarium was built in 1999. This aquarium is now home to different kinds of colorful fish and even a few sharks.

In addition, tourists can spend an evening visiting a fishing village, where they could get a taste of the local seafood. There are crabs, shrimps, lobsters, clams, oysters, and several other kind of fish - all are fresh and delicious.

Which of the following sentences is not true?

A. Nha Trang is a nice seaside resort

B. Tri Nguyen Aquarium is on an island

C. Most of tourists are interested in snorkeling and scuba diving

D. The local seafood is fresh and delicious