Question

determina numerele a,b,c stiind ca sunt direct proportionale cu numerele 6,8,10 si ca 2a +b+c=15

Answer 1

a/6=b/8=c/10     b=8a/6=4a/3        c=10a/6=5a/3
2a+b+c=15
2a+4a/3+5a/3=15
2a+9a/3=15
2a+3a=15
5a=15
a=3
b=4×3/3=4
c=5×3/3=5