Level 2
Last year, Ben was 4 times as old as his son, Fred. This year, their total age is 52 years old. How old will Ben be when he is 3 times as old as Fred?
Level 2
Asher had 5 times as many buttons as Carl at first. Then each of them bought an equal number of new buttons. In the end, Carl had 42 buttons and Asher had 3 times as many buttons as Carl. How many buttons did both of them buy altogether?
Level 3
When Mrs Yang was 45 years old, her son was 2 times her daughter's age. Mrs Yang would be twice her son's age when her daughter was 30 years old. How old would Mrs Yang be when her daughter was 18 years old?