Jean Valjean is buying candlesticks and plates for his new French restaurant. He has $60 to spend on plates and candlesticks. Each plate costs $3. Each candlestick costs $6 (it comes with free candles!). Jean needs to buy a total of 15 items. How many plates and how many candlesticks does he buy? Enter the answer as an ordered pair (number of plates, number of candlesticks)

Respuesta :

Answer:

(10, 5)

Step-by-step explanation:

Total money to spend = $60

Cost of each plate = $3

Cost of each candlestick = $6

Let number of plates bought = [tex]x[/tex]

Let number of candlesticks bought = [tex]y[/tex]

Total number of items to be bought = 15

Therefore, the first equation can be written as:

[tex]x+y = 15[/tex] ..... (1)

Total money spent on plates = Number of plates bought [tex]\times[/tex] Cost of each plate = $3[tex]x[/tex]

Total money spent on candlesticks = Number of candlesticks bought [tex]\times[/tex] Cost of each candlestick = $6[tex]y[/tex]

Second equation can be written as:

[tex]3x+6y = 60[/tex]

Dividing both sides with 3:

[tex]x+2y=20[/tex] ..... (2)

Subtracting (1) from (2):

[tex]y = 5[/tex]

From equation (1) :

[tex]x = 15-5\\\Rightarrow x = 10[/tex]

Number of plates bought = 10

Number of candlesticks bought = 5

Answer as ordered pair is: (10, 5)