Question

The sum of three numbers is 35. One number is five more than a second number. It is also twice the third. Find the numbers

Answer 1

$a+b+c=35$
$a=b+5$
$a=2c$

Substitute a for b + 5 and 2c. 

$a + (a-5) + \frac{a}{2} =35$
$\frac{5}{2} a = 40$
$a=16$
$b=11$
$c=8$