John wrote a 3-digits number on a piece of a paper and asked Peter to guess it. Peter asked:"Is the number 173 ?".John replied:"One of the digits is correct, the position of that difiy is also correct". Peter asked again:"Is the number 123 ?". Two digits are correct, but the position of those digits are wrong." Peter asked again:"Is the number 324 ?". All three  are correct , but the digits are all in the wrong places." What is the number written by John ?

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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