Answer: No solution
x(5-2)(2-2)=12
x(3)(0)=12
Since its times by 0 the x goes away and it is
0=12
No solution
The profit or loses change should he receive is $19.5
Given,
The price of Dozen of mangoes is $.15
Robert gives $20
The change should be is $20-$.15 =$19.5
When a person buys an item at one price and later sells it at a different one, he either earns a profit or loses money. There are several phrases that are involved with the complete transaction procedure. For instance, cost price (C.P. ), selling price (S.P. ), discount, marked price, profit, and loss. Let us go through the definitions of these terminologies one by one.
Price Cost
For example, if Neil purchased an umbrella for $8, the cost price of the umbrella is $8. The abbreviation is C.P.
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You need an equation for the solutions and an equation for the acid.
Let x = amount of 20% acid solution
Let y = amount of 50% acid solution.
The equation for the solution:
You want a total of 12 liters, so
x + y = 12
The equation for the acid:
The 20% solution has 20% acid, so in x liters of the 20% solution, you have 0.2x liters of acid.
The 50% solution has 50% acid, so in y liters of the 50% solution, you have 0.5y liters of acid.
The combined solution is 12 liters of 30% acid, so it has 30% * 12 liters of acid = 3.6 liters of acid.
0.2x + 0.5y = 3.6
Now you solve the two equations in a system of equations.
x + y = 12
0.2x + 0.5y = 3.6
Multiply the second equation by 10:
2x + 5y = 36
Multiply the first equation by -2:
-2x - 2y = -24
Add the last two equations:
3y = 12
y = 4
Substitute y = 4 in the first original equation:
x + y = 12
x + 4 = 12
x = 8
Answer: 8 liters of 20% solution and 4 liters of 50% solution.