Problem
QUESTION 3 Use a proportion to solve the problem. If a spring stretches 6 meters when a 7-kilogram weight is attached to it, how much will it stretch when a 42-kilogram weight is attached to it? \( 35 \mathrm{~m} \) \( 39 \mathrm{~m} \) \( 38 \mathrm{~m} \) \( 36 m \)
Solution
Step 1 ：\( \frac{6}{7} = \frac{x}{42} \)
Step 2 ：\( x = \frac{6 \times 42}{7} \)
Step 3 ：\( x = 36 \)
