Answer:
22 pencils
Step-by-step explanation:
Using key words and expressions, you can find the number of pencils each boy has and then add them together to find the sum:
Liam: 6 pencils
Noah: 'twice as many' as Liam or 6 x 2 = 12 pencils
Jacob: '1/3 as many as Noah' or 12 x 1/3 = 4 pencils
6 + 12 + 4 = 22 pencils total
