Question 4853
let x - tweedledums weight
y= tweedledee's weight

x+2y=361
2x+y=362

Multiply the first equation by -2
-2x-4Y=-722
2x+y=362

Add them:

-3y=-360

divide by -3
y-120 

x+2(120)=361
x+(240)=361
x=361-240
x=121 
Check:
2*121+120=362
2*120+121=361

tweedledee weighs 120 and tweedledum weighs 121