Впарке 30 % всех деревьев клены , четвертая часть - дубы , остальные берёзы . сколько всего берёз в парке если известно , что берез на 120 больше , чем кленов ?
On the night of 8 may 1992, armenian gangs carried out the operation ended with the occupation of shusha. occupation of shusha, has completed the occupation of nagorno-karabakh. during the occupation, killed 200 people, more than 600 were wounded, 150 became invalids, 552 child became orphans, more than 20 thousand people were displaced. the occupation had destroyed more than 600 historical monuments, 7 preschool institutions, 22 secondary schools, economic and cultural-educational technical schools, 8 culture houses, 14 clubs, 20 libraries, 2 cinemas, 3 museums, tourist base, factory of eastern musical instruments and hundreds of. cultural monuments.
дуб-25 проц
берез-100-(30+25)=45 проц
1)45-30=15 проц
15проц=120 деревьев
100 проц=х
2)х=(100*120)/15=800 деревьев всего
3)х-30
800-100
х=800*30/100=240 клена
4)360 берез
5)800-(360+240)=200 дуба
пропорцию составь сам к 4 и 5 действию