# Large Marbles cost 25 cent and small marbles cost 10 cents. Sally buys 18 marbles for a total cost of 2.85. How many large marbles does she buy?

##### 1 Answer

Apr 22, 2018

#### Answer:

7

#### Explanation:

Let

Let

The large marbles cost

Add to that the cost of the small marble that she bought:

We are told that equals

We are told that

Substitute equation [2] into equation [1]:

Use the distributive property:

Combine like terms:

Divide both sides by