Question

If I bought 21 pound of beef to make a burger for 9 person party how many people could I invite to dinner if i have 7 pounds? ( Assume people at both parties eat the same amount)

Answer 1

For the equation cross multiplication is key. i do recommend you take in the fact it takes 2.3333etc. to make each persons portion

but none the less the quation should look like 7x9=63 then 63/21 which gives you 3.

you could also do 12/9=2.3, then 7/2.3= 3.04 for a more accurate answer

Answer 2

3 people

Explanation:

We can write a proportion, putting lbs of beef over people

21 lbs 7 lbs

----------- = ------------

9 people x people

Using cross products

21x = 7*9

21x = 63

Divide each side by 21

21x/21 = 63/21

x =3

You can have 3 people