Question

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?

Answer 1

An egg and cheese biscuit was $3.65.

Explanation:

Liam's breakfast was:

`P = E + C + M`

Where:

P: total price

E: egg

C: cheese biscuit

M: carton of milk

`P = E + C + M`

`5.65 = E + C + M` (1)

Now, Finn's breakfast was:

`P = E + C + 2*M`

`7.65 = E + C + 2*M` (2)

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

`7.65 - 5.65 = 2M - M`

`M = 2`

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:

`5.65 = E + C + M`

`5.65 - 2 = E + C`

`E + C = 3.65`

Therefore, an egg and cheese biscuit was $3.65.

I hope it helps you!