Răspuns :
a/2 + a/4 = 141
2a+a = 141 x 4
3a = 564
a = 188
verificare
188/2+ 188/4 = 94+47 = 141
2a+a = 141 x 4
3a = 564
a = 188
verificare
188/2+ 188/4 = 94+47 = 141
1/2a+1/4a+2a=33
Amplifici prima si ulta fractie cu2 respectiv 4
2/4a+1/4a+8a/4=33
11/4a=33|•4/11
a=132/11