9514 1404 303
Answer:
66 2/3 cm
Step-by-step explanation:
The weight in kilograms is 20, so the stretch in cm is 20/3 = 6 2/3 cm.
When the 60 cm spring is stretched an additional 6 2/3 cm, its length will be ...
60 +6 2/3 = 66 2/3 . . . cm
out of these, it would be 4x - 4 * 2
The middle number would be (14+15)/2 = 14.5
How I found that is I did (14+15)/2.
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