Question

Total cost for cookie and lemonade is 1.80. If lemonade costs 1.00 more than the cookie, how much was the lemonade?

Answer 1

The lemonade costs 1.4.

Explanation:

This question is solved using a system of equations.

I am going to say that:

x is the cost of a cookie.

y is the cost of a lemonade.

Total cost for cookie and lemonade is 1.80.

This means that
`x + y = 1.8`.

As we want y, we have that
`x = 1.8 - y`

Lemonade costs 1.00 more than the cookie?

This means that:

`y = x + 1`

So

`y = 1.8 - y + 1`

`2y = 2.8`

`y = (2.8)/(2)`

`y = 1.4`

The lemonade costs 1.4.