Don’t get stuck too long to balance the weight ! we have the answer for you in 100 escapers level 18 walkthrough so you can pass this stage easily !
solution guide :
find room with 7 bags, each bags have different colors
go to the scale and you can weigh each bag to see the weight
but if you want to find the answer :
Put the light blue, purple, green bags on the left scale
Put the blue, red, orange, white bags on the right scale
now door will open :d
go to the door and go to next stage !