Sixth grade word problem help

Question

Allison's father, an archaeologist, is sharing his latest diggings with Allison's class: Stone tablets from an ancient culture. The number of notations systems used on the tablets includes squares and circles. Allison holds up one stone table with 1 square and 1 circle. This represents the number 14. Another tablet, representing the number 34, contains 2 squares and 4 circles. What number would be represented by a table with 1 square and 3 circles?

Answer 1

34 - 14 = 20 and the the difference between the two tablets is 1 square and 3 circles, so 20.