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shaylawhitacre
28.03.2022 •
Mathematics
Sanjay has 35 pens and Mohan has 40 pens. These two, along with four other friends, collect their pens together. If Sanjay takes back his pens, the average number of pens with the rest of them is 20. What will be the average number of pens with the rest of them, if Mohan also takes back his pens?
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Ответ:
"First, you have 35 total pens in the box. 15 are green. to find how many red pens you need to find the difference between 35 and 15 to get how many red pens there are. (35-15= 20) Therefore, there are 20 red pens. The ratio needs to be green pens to red pens. So, there is 15 green and 20 red ( 15/20 or 15:20) Simplify that by 5 and you get 3/4 or 3:4. "
Ответ:
23.
If we take the triangle on the right and put it on the left we have a rectangle, 15 by 11, so area 165.
165
24.
Perimeter: 11 + 14 + 11 + 14 = 50
Area: 9 by 14 = 126