Question 518852
Let
Present age of Janey = j
Present age of Peter = p



Janey is twice as old as Peter. 
j=2p.........(1)
The sum of their ages is 5 times Peter's age less 48.
j+p=5p-48
j=5p-48-p
j=4p-48.........(2)
Put the value of j from (1) to (2) 
2p=4p-48
2p-4p=-48
-2p=-48
-2p/-2=-48/-2
p=24
Put the value of p in (1)
j=2p
j=2*24
j=48

Present age of Janey = j = 48 years old
Present age of Peter = p = 24 years old