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a fost răspuns

Daca a/4=b/9=c/5 demonstrati ca b=a+c si aflati a,b,c stiind ca 2a+3c =46

Răspuns :

Lucasela
a/4=b/9=c/5=k => a=4k; b=9k; c=5k
a+c=4k+5k=9k=b
deci  b=a+c

2a+3c=8k+15k=23k
23k=46 => k=2
a=4·2=8
b=9·2=18
c=5·2=10

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