Question

3 plates cost 7 pounds in total . how much do 12 plates cost ?

Answer 1

27.96

Explanation:

7 pound ÷ 3 = 2.33 pound per plate

12×2.33=27.96

Answer 2

Answer: 28 pounds

Explanation:

We can create a proportion to help us solve.

`\displaystyle (3\;plates)/(7\;pounds) =(12\;plates)/(x\;pounds)`

Now, we will cross-multiply.

3 * x = 12 * 7

3x = 84

Lastly, we will divide both sides of the equation by 2.

x = 28

12 plates will cost 28 pounds.