A rectangular. carpet has an area of 240 sq.cm. If its diagonal and the longer side are together equal to five times the shorter side; the length of the carpet is

1)  10 cm

2)  24 cm

3)  26 cm

4)  27.5 cm

The average of 30 results is 20 and the average of  other 20 results is 30. What is the average of all the results?

1) 24

2)48

3)25

4)50