book Maths Puzzle Numerical Ability

An infinite geometric series has 1 and 1/5 as its first two terms: 1,1/5,1/25,1/125,..... What is the sum, S, of the infinite series?
a)1/25
b)1/4
c)1
d)5/4

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book Other Question

The ages of Old and Young total 48. Old is twice as old as Young was
when Old was half as old as Young will be when Young is three times as
old as Old was when Old was three times as old as Young.
How old is Old? 3X+12y > 4

my work
12 y > -3X+ 4
divide it all by 12

y > -1/4X + 1/3