Tom,Ted,Tony,Terry worked together on a job.The job paid $500.Each boy was paid according to the amount of work he contributed to the job.Ted and Tony earned $280 together.Ted and Tom have $260,and Ted and Terry got $220.What percent of the job did each boy do?
1 answer

Ted+Tony=280
Ted+Tom=260
subtract the second equation from the first
a) TonyTom=20
Ted+Terry=220
Ted+Tony+Tom+Terry=500
Subtract a) from the last line
Ted+2Tom+Terry=480
but Ted+terry=220 so subtracting
2Tom=260
I assume you can take it from here.