Jan work 4 hours on a job and ted worked 5 hours both were paid the same hourly rate together they earned $31.50 how much did each receive

This could by seen as a ratio:

4:5

Add up the ratio. Then divide the money earned, by the ratio.

4 + 5 = 9

31.50 / 9 = 3.5

Then you times the individual hours by this.

4 x 3.5 = $14

5 x 3.5 = $17.5

So Jan earned $14

And Ted earned $17.50