Grades 9-10 Video Solutions 2014-Grades 9-10 Video Solutions 2014 problem5

Grades 9-10 Video Solutions 2014 problem5

Video Transcription

Video Summary

In the video, the problem involves determining when the last digit of a year was greater than the sum of the other three digits. Starting from 2014, the speaker checks years in reverse. In 2009, the digits 2, 0, and 0 sum to 2, which is less than the last digit, 9. This satisfies the condition, indicating that 2009 is the last year this occurred. Since 2014 minus 2009 equals 5, the answer is that it happened 5 years ago. Thus, the solution is 5 years, or option C.

Keywords

year digits

sum comparison

2009

reverse check

mathematical problem