Peter bought 4 new notebooks for school. 2 of them are green, one is black and the other one is pink. The total cost was $45. If the black notebook cost $15, and the pink one cost $10, how much did the green notebooks cost each?
Питер 4 дафтарчаи нав барои мактаб харидааст. 2-тои онҳо сабз, яктои он сиёҳ ва дигаре гулобӣ аст. Ҳамагӣ нарх $45 буд. Агар дафтарчаи сиёҳ $15 арзиш дошта бошад, ва дафтарчаи гулобӣ $10 арзиш дошта бошад, ҳар дафтарчаи сабз чанд пул арзиш дорад?
How much did the black and pink notebooks cost together? ** The black and pink notebook cost a total of $15 + $10 = $<<15+10=25>>25
How much did the green notebooks cost together? ** The green notebooks cost a total of $45 - $25 = $<<45-25=20>>20
How much did each green notebook cost? ** Each green notebook cost $20 / 2 = $<<20/2=10>>10
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How much did the black and pink notebooks cost together? ** The black and pink notebook cost a total of $15 + $10 = $<<15+10=25>>25  
How much did the green notebooks cost together? ** The green notebooks cost a total of $45 - $25 = $<<45-25=20>>20  
How much did each green notebook cost? ** Each green notebook cost $20 / 2 = $<<20/2=10>>10  
#### 10