Ans.
Currently :
A+B+C+D = 76
According to ques , after 7 years
A+B+C+D = 7x+6x+5x+8x = 76+7*4
26x = 76 + 28
X = 104/26
x = 4
C?s present age = 5x ? 7 =20 ? 7
= 13
Let the average of 8 men be x. Age of new man be N.
Total age of 8 men = 8x
? x + 4 = ((8x ? 30) + N)/8
? 8x + 32 = 8x ? 30 + N
? N = 32 + 30
? N = 62
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