Question 483009
A says to B "my present age is five times of your age when i was as old as you are now." 
A = 5B
:
 The sum of their ages is 48 years.
A + B = 48
B = (48-A)
Replace B with (48-A) in the 1st equation
A = 5(48-A)
A = 240 - 5A
A + 5A = 240
6A = 240
 A = {{{240/6}}}
 A = 40 yrs old
and
B = 48-40
B = 8 yrs old
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