英语翻译in a two-digit number,the units digit is greater than th

Suppose the tens digit is x,the units digit is x+3,the original number is x*10+(x+3),the obtained number is (x+3)*10+x;(x+3)*10+x+x*10+(x+3)=121,calculate x=4the original number is 47,the obtained number is 74题目：已知一个2位数,个位上的数字比十位上的数字大3,如果将十位和个位数字调换,则新组成的这个数字和原数字之和为121,求这2个数字分别为多少。