Question 10:
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is ...
Question 5:
The clock shows the last time Anna saw before she sleeps. She wakes up at 6:15am. How long did she sleep?
Answer: She slept minutes