Question

a+b+c=625. b:a=2 rest 5. c:b=2. Cat este a, b, c?

Answer 1

a+b+c=625 
b:a=2 rest 5 ⇔ (2×a)+5=b ⇔ 2a=b-5 ⇒ a=(b-5)/2 
c:b=2 ⇒ c=b×2
(b-5)/2 +b +2b= 625 ⇔ [ b-5+2b+2×2b ] / 2=625 ⇔ b-5+2b+4b=625×2 ⇔7b-5=1250 ⇔ 7b=1250+5⇔ 7b=1255 ⇔b=1255:7 ⇒b=179 rest 2 
a=((1255:7) -5)/2 = (1255-35)/2 = 610
c=(1255:7)×2= 2510:7 358 rest 4

4270:7 + 1255:7 + 2510:7 = 8035:7