Answer:
18
Step-by-step explanation:
15 x 2 = 30
30 - 12 = 18
18 girls are in his class
Answer:
finding the number of equal-sized parts into which a number can be split
Step-by-step explanation:
Let us split the number 80 into 10 equal parts.
80 = 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 + 8
= 8 + 8 + 8 +...to 10 times
= 8(10)
or ![\frac{80}{10} =8](https://tex.z-dn.net/?f=%5Cfrac%7B80%7D%7B10%7D%20%3D8)
So, if N is any number and p is one of its equal part, then the number of parts into which N is split by p is
.
Hence, finding the number of equal-sized parts is best modeled with a division expression.
If he ate 4 of them, but it means he ate 2/5 muffins,
4 muffins = 2/5 muffins
You substitute x muffins for how much muffins she baked in all -
2/5* x muffins = 4
2/5 multiply by 2/5 to cross it out. Do the same to the other side.
x= 4 *5/2
x = 10 muffins
So there were 10 muffins in all
Answer: 12 sides
Step-by-step explanation:
The sum of the interior angles of a polygon is 180(n-2), where n is the number of sides
![180(n-2)=1800\\\\n-2=10\\\\n=12](https://tex.z-dn.net/?f=180%28n-2%29%3D1800%5C%5C%5C%5Cn-2%3D10%5C%5C%5C%5Cn%3D12)
5x-2>3
=> 5x > 3+2
=> x > 5/5
=> x > 1