Question 550016
She passed 1/20 of her life before she started school.
 She spent 3/20 of her life in school;
 She worked for 1/10 of her life before she got married.
 She was married for 2/5 of her life.
 Her husband died after 7/10 of her life. 
 From reading uncle Harry's gravestone you find out that she has been a widow for 24 years.
 How old is aunt Helen?
:
Let a = Helen's present age
:
From the statement "Her husband died after 7/10 of her life." 
and 
"she has been a widow for 24 years." (we can ignore the other statements);
a = {{{7/10}}}a + 24
a - {{{7/10}}}a = 24
{{{3/10}}}a = 24
3a = 10*24
3a = 240
a = 240/3
a = 80 yrs old is Helen