Ke is twice as old as Amy. Seven years ago, the sum of their ages was 31. How old is each person this year
k = 2a
k-7 + a-7 = 31
so,
2a-7 + a-7 = 31
3a-14 = 31
3a = 45
a = 15
So,
Amy is 15 and Ke is 30
7 years ago, 8+23 = 31
k-7 + a-7 = 31
so,
2a-7 + a-7 = 31
3a-14 = 31
3a = 45
a = 15
So,
Amy is 15 and Ke is 30
7 years ago, 8+23 = 31