 
<translate> Lizzy: Tom na Devin anọwo na-akụzi ihe ruo ngụkọta nke afọ 70. Devin anọwo na-akụzi ihe ruo ihe na-erughị ọkara afọ ise nke afọ Tom. Afọ ole ka Tom ji kụzie ihe? Mụ: Hmmm, ka m chee echiche. Echere m na nke a bụ ihe ngwọta zuru ezu: <eng> Lizzy: Tom and Devin have been teaching for a total of 70 years. Devin has been teaching for 5 less than half the number of years that Tom has. How many years has Tom been teaching?.
Me: Hmmm, let me think. I think this is the detailed solution: 