Question

Sa se afle nr a b c d stiind ca b=2×a, c=b+35, d=b+c+12, a+b+c+d=1000

Answer 1

b=2a    c=b+35=2a+35   d=2a+2a+35+12=4a+47
 a+b+c+d=1000=a+2a+2a+35+4a+47=9a+82=1000
9a=1000-82=918
a=918/9=> a=102
b=2a=2*102=> b=204
c=b+35=204+35=>c=239
d=b+c+12=204+239+12=443+12=> d=455
102+204+239+455=306+239+455=545+455=1000