Grades 9-10 Video Solutions 2023-2023_9-10

Video Transcription

Video Summary

Bob rearranges blocks numbered 1 to 90 by taking three from the top to form a new tower with blocks in descending order. To find how many blocks are between blocks 39 and 40 in the new configuration, we identify the sequence: every three blocks read from bottom to top sort themselves in triplets like 88, 89, 90. Following the pattern, blocks 41, 42, 37, and 38 are arranged between 39 and 40. Therefore, there are four blocks between block 39 and block 40.

Keywords

blocks

rearrangement

sequence

tower

pattern