Solution:

15

Explanation:
3drink = 30 ....... EquationA
1drink + 2 burger = 20 ....... EquationB
burger + 4 fries = 9 ....... EquationC
burger + fries * drink = ?

From EquationA
drink = 10

From EquationB
burger = (20-10)/2 = 5

From EquationC
fries = (9-5)/4 = 1

Hence
burger + fries * drink = 5 + 1 * 10 = 5 + 10 = 15

Solution:

Scooter B

Solution:

The two bars are equal in length.

Explanation:
It's an optical illusion that makes you believe that bar A is longer because of the railway tracks.

Solution:

3

Explanation:
Note: Glass 5 6 and 7 not possible as there is a blocked connection.
Now, as the connection to 3 is lower than that of 2, it will fill first while rest beer glasses will remain empty.

Solution:

3 and 7

Explanation:
Painters 3 and 7 are the only painters that match all nine circled areas.

Solution:

It can be done as shown in the picture below.

Solution:

Six item that does not belong to this era are :
1. Plane
2. Table lamp.
3. Scooter.
4. Sunglasses.
5. Earphones
6. Mobile phone.

Solution:

7

Solution:

The sleeping baby is marked in the picture below.

Solution:

3rd.

Explanation:
Rule: Take the bottom row, flip it, and put it on the top.