the names of who have solved the first question:
Ahmed Al-Aradi from bahrain

This is the first question's answer

This practice is similar to first question

↓This is second question↓
you can send for us your answers until 13 December

Send your solution to @mathcenter

the names of who have solved the first question:
Easy:Ahmed Al-Aradi from bahrain
Medium:no body
Hard:no body

@worldmath

This is the second question's answer(easy and medium)

This is the second question's answer(hard)

This practice is similar to the second question

↓This is third question↓
you can send for us your answers until 20 December

@worldmath

Send your solution to @mathcenter

the names of who have solved the third question:
Easy:
Sadegh mahdavi from Iran
Ahmed Al-Aradi from bahrain
Hassan H.Rostami from Iran
Medium:
Ahmed Al-Aradi from bahrain
Montana koochaki from Iran
Hassan H.Rostami from Iran
elnabgha mohamed from sudan

@worldmath

This is the third question's answer

This practice is similar to the third question

↓This is fourth question↓
you can send for us your answers until 27 December

@worldmath

Send your solution to @mathcenter

the names of who have solved the fourth question:
Easy:
Ahmed Al-Aradi from bahrain
Hassan H.Rostami from Iran
Anwar Alkamali from yemen
Waheed alsalehi from yemen
Medium:
Hassan H.Rostami from Iran
Anwar Alkamali from yemen
Hard:
Anwar Alkamali from yemen

@worldmath

This is the fourth question's answer(easy and medium)