Question

Can anyone help me with my math?
Question: Joe tossed 4 into the pot. Their average weight was 6 lb. Then he tossed in 5 more whose average weight was 7 lb. Then he threw in a big one. The overall average weight of all of them was 7 lb. What did the big one weigh?

Answer 1

(4(6)+5(7)+x)/10=?

Answer 2

hello???

Answer 3

Ohh that's how I do it?

Answer 4

kind of, im trying to help you solve the equation....

Answer 5

Thank you so much

Answer 6

okay but you need to give me an answer to the equation

Answer 7

(4(6)+5(7)+x)/10=?

Answer 8

6x4+7x5=49 first sum
then add a big one with weight x
new sum=49+x
now u have 10 pots at the end
49+x/10=7
49+x=70
x=21

Answer 9

omg. no one every lets people figure it out themselves.

Answer 10

OH MY GOD I LOVE U GUYS ^_^

Answer 11

but i did a mistake 6x4+7x5=59 not 49 so answer is 11 sorry again

Answer 12

Its ok ^_^ THank u

Answer 13

Tiny hint. NEVER use the symbol "x" to mean multiplication. It is far too confusing.
Bigger hint. WRITE DOWN clear definitions of any variable you introduce.

Here's a really clear version - just for an example.

If "w" is the weight of the large thing that we are tossing into the pot, we have:

4*6 lb + 5*7 lb + w = Total weight of all the things we are tossing into the pot.
10*7 lb = Total weight of all the things we are tossing into the pot.

The rest is arithmetic/algebra:

4*6 lb + 5*7 lb + w = 10*7 lb

24 lb + 35 lb + w = 70 lb

59 lb + w = 70 lb

w = 70 lb - 59 lb = 11 lb

Prove it!

(24 + 35 + 11)/10 = (24 + 11 + 35)/10 = (35 + 35)/10 = 70/10 = 7 -- Check!