Answer:
12 inches
Step-by-step explanation:
The 7 parts of the ratio represents Ryan's string of 42 inches.
Divide 42 inches by 7 to find the value of one part of the ratio.
42 inches ÷ 7 = 6 inches ← value of 1 part of the ratio, thus
2 × 6 = 12 inches ← length of Sam's string