Let a cup of coffee be represented by = c
Let an omelet be represented by = o
Part A:
The bill at one table for three cups of coffee and five omelets is $7.60.
So equation is : 
...(1)
The bill at another table for one cup of coffee and two omelets is $2.90.
So, equation is : 
...(2)
From equation (2) we get 
.... (3)
Part B:
Substituting the value of 'c' from equation (3) in (1)
As c=2.90-2o
Part C:
Hence, cost of 1 cup of coffee is $0.70
Cost of 1 omelet is $1.10
Answer:
Quantity of milk = 60 x 2/3 litres = 40 litres.
Quantity of water in it = (60- 40) litres = 20 litres.
New ratio = 1 : 2
Let quantity of water to be added further be x litres.
Then, milk : water = 40 /20 + x
Now, 40 /20 + x = 1/2
20 + x = 80
x = 60.
Quantity of water to be added = 60 litres.
Answer: The answer is 22
Step-by-step explanation: you divide the 36 and the 9 to get 4 then you add the 18 and the 4 to get 22
Answer: volume of the cube is (7 cm)^3= 343 cm^3
