4. In four years' time Evie will be three times older than she was two years ago. How old will Evie be in one year's time?
A 2
B 3
C 4
D 6
E 7
4. D Let Evie's age in years now be $x$. The information in the question tells us that $x+4=3(x-2)$. Therefore $x+4=3 x-6$ and hence $2 x=10$ and $x=5$. Therefore in one year's time Evie will be 6 .