Let (a) be the first cat let (b) be the second cat a +b=11kg-----(1) a=b+1500g⇒(1.5 kg)-------(2) so now u have a system of two unknowns a=11-b substitute a in (2) 11-b=b+1.5 11-1.5=2b 2b=9.5 b=9.5/2=4.75 subs. b in (1) a+b=11 a+4.75=11 a=11-4.75=6.25 so cat (a) is 6.25 kg and (b) is 4.75 kg hope I helped
