Question 966495
Michael is 2 times as old as Christopher.
<pre>
M = 2C
</pre>
20 years ago, Michael was 6 times as old as Christopher.
<pre>
M-20 = 6(C-20)

System of equations

M = 2C
M-20 = 6(C-20)

2C-20 = 6(C-20)

2C-20 = 6C-120
  -4C = -100
    C = 25

Christopher is 25
</pre>
Michael is 2 times as old as Christopher.
<pre>
Michael is 50.

Checking: 20 years ago, Michael was 30 and Christopher was
only 5, and 30 is 6 times 5.

Edwin</pre>