>>10822280easy pyzy
3x=30|/3
x=10
10+2y=20|-10
2y=10|/2
y=5
5+2a=13|-5
2a=8|/2
a=4
now the bottom is a bit more complex,as you can see there is only one shoe the fat guy isnt wearing a wistle on his neck and theirs only one wistle so the formula should go something like this
(x/2)+(y-a/2)*a/2 =(10/2)+(5-4/2)*4/2
5+3*2=11
ats.: ?=11