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Answer

3.5 would be the maximum possible radius ( that is , it depends on how it’s folded, they edges may be together on the end or my be folded to be smaller too)

Answer

Age should be 20 years .

Present avg of the initial 4 friends should be (4*21+ 4+4+4+4)/4 = 25

After the new person added , avg =24

(F1+F2+F3+F4+Fnew)/5 =24

F1+F2 +F3+F4+Fnew = 120

Divide by 4 on both sides

(F1+F2+F3+F4)/4 +Fnew/4=30

Fnew/4 = 5

Fnew =20