Answer:
![40](https://tex.z-dn.net/?f=40)
Step-by-step explanation:
Let
be the number.
![\frac{1}{4} x+\frac{1}{5} x=18](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B4%7D%20x%2B%5Cfrac%7B1%7D%7B5%7D%20x%3D18)
![\frac{9}{20} x=18](https://tex.z-dn.net/?f=%5Cfrac%7B9%7D%7B20%7D%20x%3D18)
![x=18 \times \frac{20}{9}](https://tex.z-dn.net/?f=x%3D18%20%5Ctimes%20%5Cfrac%7B20%7D%7B9%7D)
![x=40](https://tex.z-dn.net/?f=x%3D40)
Answer:
Hi
Step-by-step explanation:
<span>0.31818181818 would be your answer. However, if you round up, your answer would be 0.32. </span>
Answer:
Answer: k must be 5/2 or 1
Step-by-step explanation:
![{ \tt{ - {2k}^{2} + 7k - 5 = 0}}](https://tex.z-dn.net/?f=%7B%20%5Ctt%7B%20-%20%20%7B2k%7D%5E%7B2%7D%20%20%2B%207k%20-%205%20%3D%200%7D%7D%20)
» Factorise the equation:
![{ \tt{ {2k}^{2} - 7k + 5 = 0 }} \\ { \tt{(2k - 5)(k - 1) = 0}} \\ \\ { \tt{k = \frac{5}{2} \: and \: 1 }}](https://tex.z-dn.net/?f=%7B%20%5Ctt%7B%20%7B2k%7D%5E%7B2%7D%20-%207k%20%2B%205%20%3D%200%20%7D%7D%20%5C%5C%20%20%20%7B%20%5Ctt%7B%282k%20-%205%29%28k%20-%201%29%20%3D%200%7D%7D%20%5C%5C%20%20%5C%5C%20%7B%20%5Ctt%7Bk%20%20%3D%20%20%5Cfrac%7B5%7D%7B2%7D%20%20%5C%3A%20and%20%5C%3A%201%20%7D%7D)
First subtract 78.2 from 287 and get 208.8. Then divide 208.8 by 0.5 and get x=417.6