" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
12-x - czwórki
[5x+4(12-x)]:12 = 4,75 |*12
5x+4(12-x) = 57
5x+48-4x = 57
x = 57-48
x = 9
9 - piątki
12-9 = 3 - czwórki
5x+48-4x=57
x=9
9 piątek
12-9=3 czwórki
12-x=ilość4
¹/₁₂(5x+4(12-x))=4,75/×12
5x+48-4x=57
x=57-48
x=9
12-9=3
miała 9 piątek i 3 czwórki