Question 416227: a worker gets 60c an hour for ordinary time and 90c an hour for overtime. If she gets $32.40 for a 50 hour week how many hours are overtime? Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! ordinary time = x
overtime = y
x+y = 50............1
0.60x+0.90y=32.40
multiply by 100
6x+9y=3240...........2
...
x+y=50 .............1
6x+9y=3240 .............2
multiply (1)by -6
Multiply (2) by 1
multiply (1)by -6
Multiply (2) by 1
-6x-6y= -300
6x+9y=324
Add the two equations
3y=24
/3
y=8 overtime hours
Plug value of y in
1x+1y=50
1x+8=50
x=42 normal hours
