Question

[Trần Minh Tâm]

Tom 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 40. The number of numbers that is erased on the board at most is………

Answer 1

[Nguyễn Minh Quang]

The number of numbers that is erased on the board at most is 5 number ( 1,2,3,4,5)