How much did each of the 3 new workers carry if each worker carried the same amount?

Question

At a construction site, 6 workers carted an average of 15 kilograms of building materials. Another 3 workers joined them and the average amount they carried became 18 kilograms. How much did each of the 3 new workers carry if each new worker carried the same amount?

Answer 1

6*15=90 kg

6+3=9 workers

9*18=162 kg

162-90=72 kg

72/3=24 kg was carried by each of the 3 new workers

6 workers carried an average of 15 kg for a total of 90 kg

3 workers each carried 24 kg for a total of 3*24=72 kg

90+72=162 kg carried by 9 workers averages out to be 162/9=18 kg