" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x=4%
x+120=100%
................
100x=4(x+120)
100x=4x+480
100x-4x=480
96x=480
x=480:96
x=5 kg soli trzeba dosypać
x-4%
x=120*4/100=12*2/5=24/5=4,8kg
x=0.04x+4.8
x-0.04=4.8
0.96x=4.8|:0.96
x=5