Question

Va rog frumos pls ajutati-ma! Aflati a,b,c daca sunt a supra 3 = b supra 7 = c supra 8 si 2a + 5b -4c=108.

Answer 1

spume ca $\frac{a}{3}$=$\frac{b}{7}$=$\frac{c}{8}$=K
=> a=3K b=7K c=8K 
acum inlocuim: 6K+35K-32K=108
deci 9K=108
=> a=36 b=84 si c=96