2 Answers

Noteness · Answer 1 · 2017-09-06T21:45:45+0000

For this case we propose a system of equations:

D: Variable that represents the age of Daniel

B: Variable that represents Ben's age

According to the data we have:

$B = 3D\\B = D + 4$

SUBSTITUTING the first equation in the second:

$3D = D + 4\\3D-D = 4\\2D = 4\\D = \frac {4} {2}\\D = 2$

So, Daniel is 2 years old.

ANswer:

Daniel is 2 years old.

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