Question 104406

Let N be Nando's age and B be his brother's age. 
1.{{{N=3*B+8}}} Age relationship now.
2.{{{(N+10)=2*(B+10)+5}}} Age relationship in ten years. 
Use equation 1 to solve equation 2 by substitution
{{{(N+10)=2*(B+10)+5}}}
{{{(3B+8)+10=2B+20+5}}}
{{{3B+18=2B+25}}}
{{{B=7}}}
Substitute back into equation 1.
{{{N=3B+8}}}
{{{N=3(7)+8}}}
{{{N=29}}}
Let's verify
1.{{{N=3*B+8}}} Age relationship now.
29=3*7+8
29=29
Good answer
2.{{{(N+10)=2*(B+10)+5}}} Age relationship in ten years. 
29+10=2*(7+10)+5
39=2*17+5
39=39
Good answer.