Answer:
9:00 pm to 6:45 am = 9 hours 45 minutes = 9.75 hours
Water level drops 3/16" (or .1875") every 9.75 hours
.1875 / 9.75 = 0.0192307692 inches per hour
Step-by-step explanation:
Given:
Cost of two donuts and three cookies = $3.30
Cost of five donuts and two cookies = $4.95
To find:
The cost of each donut.
Solution:
Let x be the cost of each donut and y be the cost of each cookie.
Cost of two donuts and three cookies = $3.30
...(i)
Cost of five donuts and two cookies = $4.95
...(ii)
Multiply equation (i) by 2.
...(iii)
Multiply equation (ii) by 3.
...(iv)
Subtracting (iii) from (iv), we get


Divide both sides by 11.


Therefore, the cost of each donut is $0.75.
First subtract 8.5 from both sides, then divide the -1.2 to get x by itself
x=1.5
No info was given, plz post a pic of the equation