Select the gcf of these numbers. 48 and 60

2^2 x 3
2 x 11^2
3^2
2^3 x 5
13 cx 19^3 x 23^2

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.