Question

Write a rule or formula for finding the total number of chocolates in a 3-by-n box.

Answer 1

18+10=28

Explanation:

(3x2)+(1x3)=3x3; it means 6+3=9 and 2+2=4

(3x3)+(1x3)=3x4; it means 9+3=12 and 4+2=6

(3x4)+(1x3)=3x5; it means 12+3=15 and 6+2=8

(3x5)+(1x3)=3x6; it means 15+3=18 and 8+2=10 (total number is 28).