Question

Ответ в дробь .в коробке 15 шариковых ручек.7 из них синие 5 черные .остальные зеленые.какую часть всех ручек составляют синие и черные ручки вместе? синие и зеленые ручки вместе?

Answer 1

Ответ 1: 
7+5=12 ручек  синие и черные вместе
12:15=12/15=4/5 часть  синие и черные
15-12=3 ручки зеленые
3+7=10 синие и зеленые вместе
10:15=10/15=2/3 часть  синие и зеленые вместе.

Answer 2

7+5=12
 это 12/15 или 4/5 это синие и чёрные ручки
15-12=3 это зелёные ручки
7+3=10
это 10/15 или 2/3 это синие и зелёные ручки

Answer 3

Calculation of the Proportion of Blue and Black Pens

To calculate the proportion of blue and black pens out of the total number of pens, we need to add the number of blue pens and the number of black pens together and divide it by the total number of pens.

Given that there are 15 pens in total, with 7 of them being blue and 5 of them being black, we can calculate the proportion as follows:

Proportion of blue and black pens = (Number of blue pens + Number of black pens) / Total number of pens

Proportion of blue and black pens = (7 + 5) / 15

Proportion of blue and black pens = 12 / 15

Proportion of blue and black pens = 0.8

Therefore, the proportion of blue and black pens out of the total number of pens is 0.8.

Calculation of the Proportion of Blue and Green Pens

To calculate the proportion of blue and green pens out of the total number of pens, we need to add the number of blue pens and the number of green pens together and divide it by the total number of pens.

Given that there are 15 pens in total, with 7 of them being blue and the remaining pens being green, we can calculate the proportion as follows:

Proportion of blue and green pens = (Number of blue pens + Number of green pens) / Total number of pens

Proportion of blue and green pens = (7 + (Total number of pens - Number of blue pens)) / Total number of pens

Proportion of blue and green pens = (7 + (15 - 7)) / 15

Proportion of blue and green pens = 15 / 15

Proportion of blue and green pens = 1

Therefore, the proportion of blue and green pens out of the total number of pens is 1.