Answer:
6. D
8. D
10. B
Explanation:
6.
Between any two rational numbers there is an infinite number of numbers.
Answer: D
8.
If all cities are on a straight line, first, there is city A, then you go along the straight line in one direction 500 km to city B, then you go in the same line and direction another 200 km to city C, then the distance from city A to city C is 700 km. Here, we are not told any information about a straight line and walking only in one direction, so there is not enough information to find the answer. The three cities may be three vertices in a triangle. We cannot answer the question.
Answer: D
10.
There are 100 participants to start with.
After the first round, 5% of the participants drop out.
100% - 5% = 95%
That means that 95% of the participants are still running in the second round.
95% of 100 = 0.95 × 100 = 95
The second round starts with 95 participants.
After the second round, 20% of the current participants drop out.
100% - 20% = 80%
That means that 80% of the participants who started the second round are still running in the third round. The second round started with 95 participants. 80% of 95 participants are still there.
80% of 95 = 0.8 × 95 = 76
Answer: B