Question 53758
Aaron ( A SAY), Betsy ( B SAY ),and Charita ( C SAY )work part time at the public library. Betsy works 4hours more each week than Aaron
B = A + 4 .................................1
, and together they work as many as Charita.
A + B = C....................2..........SUBSTITUTING FOR B FROM EQN.1 IN EQN.2
A+A+4=C
C= 2A+4...........................................3
 How long does each person work if their total is 45h?
A+B+C = 45.........................4....SUBSTITUTING FOR B AND C FROM EQNS.1 AND 3 
A+A+4+2A+4=45
4A=45-8=37
A=37/4 = 9.25
B = 9.25+4 = 13.25
C = 2*9.25 + 4 =22.5