Answer:
Explanation:
D)The system is open, and the net external force is nonzero.
Answer:
Felicia’s mother is four times as old as Felicia. In 16 years, her mother will be twice her age. How old is Felicia now?
Explanation:
Exactly 80 liters of 20% are needed.
Let quantity of 20% alcohol solution be added : x liters
Here is the work:
> x*20% + 40 * 50% = (x+40) * 30%
> x*0.2 + 40*0.5 = (x+40)*0.3 ..(converting percentages into decimal)
> 0.2x + 20 = 0.3x + 12
> 20-12 = 0.3x - 0.2x (Rearranging similar terms)
> 8 = 0.1 x
Hence x = 8/0.1
Ans 80 Litres
Answer:
hmm I think is Salam or lukira
