How many liters of 10% silver iodide mixed with 9 liter of a 4%silver iodide solution to get 6% solution

The correct answer is "4.5 liters". A further explanation is provided below.

Step-by-step explanation:

Let the solution needed be "x".

then, according to the question,

⇒

By solving the above expression, we get

⇒

⇒                

⇒                

⇒                      

⇒                        

y = 0.77(x)

step-by-step explanation:

the jacket retains this value after 23% cut or retains 77% of original value. plug original 87 jacket price for x and the remaining value should be y.

b

step-by-step explanation:

the word superfluous means unnecessary