2 Look at the picture again and read the sentences. Write true or false.
The poster is near the door. false
1 The DVD is on the shelf.
2 The laptop is next to the DVD,
3 The shelf is near the poster.
4 The poster is under the clock.
5 The notebook is in the bag.
6 The door is between the clock and the
board.​

The Prime Minister said that the role of Parliament had much changed over the previous 10 years.
1. The judge said that he/she had never faced such a bad mistake.
2. The students said that the professor had explained the legal and political system
of Great Britain properly.
3. The policeman said that he had seen them at the station.
4. The postman said that he had brought them a recommended letter.
5. Mary said that she had studied Criminology at the Academy.
6. His aunt said that something terrible had happened.

We have two moments of history here: "now" and "then" (at particular moment in the past). Let's mark as the following:
T - Tom's age now
E - Elizabeth's age now
To - Tom's age then
Eo - Elizabeth's age then

So we have:
T - E =  To - Eo (their difference is constant)   (1)
T + E = 49                                                         (2)
T = 2Eo                                                            (3)
To = E                                                               (4)

Using (4) into (1): 
T - E =  E - Eo  
Then using (3) here:
2Eo - E =  E - Eo  
2Eo + Eo =  E + E
3Eo =  2E
E = 3/2 Eo                                                         (5)

Using (5) and (3) into (2):
T + E = 49
2Eo + 3/2Eo = 49  
3 1/2Eo = 49
7/2Eo = 49
Eo = 49 : 7/2
Eo = 14

So, Elizabeth was 14. It means now Tom is 2*14=28. Elizabeth now is 49 - 28 = 21

Answer: Elizabeth is 21, Tom is 28