20 % din x este 45. Atunci x este ...

Daca $\ \ \ \frac{a}{b}\ \ =\ \ \frac{3}{4}\ \$  si a+b=35, atunci..

Daca $\frac{4}{7}=\frac{x}{3}$   ,atunci x= 

Fie  $\angle AOB$  si  $\angle\ BOC$  adiacente, $m\left(\angle AOB\right)=40\degree$  si  $m\left(\angle BOC\right)=100\degree$  
Atunci,  $m\left(\angle AOC\right)=...$  

Fie  $\angle AOB$  si  $\angle BOC$  adiacente.  $m\left(\angle AOB\right)=40\degree$  si  $m\left(\angle BOC\right)=100\degree$  
[OD bisectoarea  $\angle AOB$  si [OE biectoarea  $\angle BOC$  
 $m\left(\angle DOE\right)=...$  

Fie  $a\parallel b$  si d secanta . Atunci x= ...  $\degree$  

 $\angle MON$  , $\angle NOP$  si  $\angle POM$  sunt unghiuri in jurul unui punct.
 $m\left(\angle MON\right)=x\degree+30\degree$  ,  $m\left(\angle NOP\right)=3x\degree-30\degree$  si

 $m\left(\angle POM\right)=2x\degree$  . Atunci....

Aflati  $m\left(\angle AOC\right)\$  din figura, stiind ca  $OC\perp OD$  si  $m\left(\angle BOD\right)=23\degree35'22''$  

 $m\left(\angle AOC\right)=\ ....$