Liam's breakfast was an egg and cheese biscuit with a carton of milk. He spent a total of $5.65. Finn spent $7.65 on an egg and cheese biscuit and two cartons of milk. How much was an egg and cheese biscuit?

An egg and cheese biscuit was $3.65.

Step-by-step explanation:

Liam's breakfast was:

Where:

P: total price

E: egg

C: cheese biscuit

M: carton of milk  

  (1)

Now, Finn's breakfast was:

  (2)      

By subtracting equation (2) from (1) we have:

Hence, the price of a carton of milk is $2, so by entering this value into equation (1) we can find the price of an egg and cheese biscuit:

Therefore, an egg and cheese biscuit was $3.65.

I hope it helps you!

5x+2x=49

7x=49

x=7. 35 apples