Mathematics, 18.02.2020 03:16 lefarrioe8621
In 20 years Mark will be three times as old as he was 10 years ago how old is he
Answers: 3
![\[(x+20) = 3*(x-10)\]](/tpl/images/0513/8043/a936a.png)
![\[(x+20) = 3x-30\]](/tpl/images/0513/8043/204de.png)
![\[(3x-x) = 30+20\]](/tpl/images/0513/8043/07901.png)
![\[(2x) = 50\]](/tpl/images/0513/8043/07169.png)
![\[x = \frac{50}{2}\]](/tpl/images/0513/8043/6ec0b.png)
![\[x = 25\]](/tpl/images/0513/8043/07b61.png)
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In 20 years Mark will be three times as old as he was 10 years ago how old is he...
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