Question

Ben is 3 times as old as Daniel and is also 4 years older than Daniel.
How old is Daniel?

Answer 1

b=3d and b=d+4

Since b=b we can say:

3d=d+4 subtract d from both sides

2d=4 divide both sides by 2

d=2

Daniel is 2 years old. (and Ben is 6 years old)