Elementary Algebra - Word Problems

[steelcantuna]

I did mine like this before watching the solution & still got the right answer(s):

L-9=S

3S+2L=153

3(L-9)+2(L)=153

[LtNoise]

im not suure how you got 192 in the equation at 17:25. please advice?

[georgewoodbury]

@LtNoise Nice catch, the number in the problem was supposed to be 192, not 292.