# Three cookies plus two donuts have 400 calories. Two cookies plus three donuts have 425 calories. Find how many calories are in a cookie and how many calories are in a donut?

##### 2 Answers

#### Answer:

Calories in a cookie

Calories in a donut

#### Explanation:

Let calories in cookies be

We multiply by

So we get :

Add the two equations so

Substitute

#### Answer:

We need to use simultaneous equations to solve this problem

#### Explanation:

Let the number of calories in a cookie be

From

Sub

Sub

Therefore, each cookie has