Value of x is 100

Because 6250/10=625.

47 × 47 = 2209

Clearly, 6 should be added to 2203 to get a perfect square.

15+5+0+12+8/5

=40/5

=8

Sum of 6 numbers $=60\times 30=180$
Sum of first 4 numbers $=4\times 25=100$
Sum of last 3 numbers $=3\times 35=105$
$\therefore$ Fourth number $=(100+105)-180$
                               $=205-180$
                               $=25$

Sum of the ages of 3 friends =3×23=69years

Sum of the ages of 4 friends =4×23=92years

∴ Age of 4th friend = 92 years - 69 years = 23 years.

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