Question

a+b=72 b=a:2
Aflati a si b
Dau coroana!

Answer 1

a + b = 72 
b = a:2 => a = 2b 
Se inlocuieste a in suma a+b cu 2b. 
a + b = 72 
2b + b = 72 
3b = 72/:3 
b =24. 
a = 2b 
a = 2•24 
a = 48. 

Answer 2

$b=\frac{a}{2}=>a=2b$
$a+b=72$
$2b+b=72$
$3b=72$
$b=\frac{72}{3}=24$
$a=2b=2*24=48$