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8 years
Not sure.............
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4
Answer:
Let 5 students age be a,b,c,d,e
A.T.Q ( according to qUesTion)
(a+b+c+d+e)/5 = 14 years
then, a+b+c+d+e = 70 years ( their age sum).....eq.1
a new student join the class
let new student be "f"
new average = 13
(a+b+c+d+e+f)/6 = 13
(a+b+c+d+e) + f = 78 years.....eq.2
putting value of eq.1 in eq.2
70 + f = 78
f = 8 years
therefore age of new student = 8 years..AnS
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