Posted by justin on .
lionel says the digits in his mystery number have a sum of 6. you say this mystery number if you count by 3's or count by 4's. what is lionel's mystery number?

math 
Ms. Sue,
12, 15, 18, 21, 24, 27, 30
12, 16, 20, 24, 28, 32
Which of those numbers meets the description?