>>6641991From the first row you should know 3*x=30
x can only be 10.
In the second row you see there are two hamburga and one drinke.
1 drinke is one x and one x is 10.
The two burgers are unknown and so I'll name them y.
There are two burger so there are 2y.
10+2y=20
One y can logically only be 5.
So now the third row.
You see one burger which is 5 and two images of the same two frites.
You can sum up the burger of the second row as 2y, but not the two images of the two frites because in the last row you can see only one of the frites.
I'll call one frite z.
Now you know there are five food products in the third row and you know already what the burger is namely the number 5.
After this there are twice unknown two frites.
You can't say 2z because 2z is z+z summed up. It has to be z^2.
You know because of the illustration there are either summed up 4 frites or twice 2 frites.
So I need to find now which is number multiplied by itself is as close as possible 2 to find out the value of z.
It's 1.41421 or -1.41421, one frite is a real object so I can't be negative.
Now I have only to insert all the right values in the last row.
One Hamburger (5)+
One Frite (1.41421)*One Drink (10)
5+14.1421=19.1421
The result rounded up is 19.
So the final answer is 19.
