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
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
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