Question

During a sale at the market​, steaks sold for ​$3 and watermelons sold for ​$2.50. Luca spent ​$19 and bought a total of 7 steaks and watermelons. How many of each did he ​buy?

Answer 1

He bought 3 steaks and 4 watermelons

Explanation:

Let

x -----> the number of steaks bought

y ----> the number of watermelons bought

we know that

`x+y=7`

`x=7-y` ----> equation A

`3x+2.50y=19` ----> equation B

Solve the system of equations by substitution

Substitute equation A in equation B and solve for y

`3(7-y)+2.50y=19`

`21-3y+2.50y=19`

`3y-2.50y=21-19`

`0.50y=2`

`y=4\ watermelons`

Find the value of x

`x=7-4=3\ steaks`

therefore

He bought 3 steaks and 4 watermelons