A Simple Math Question

[Gregory Matthews]

*   A cardboard box contains  40 marbles and it with the marbles, weighs 350 grams.

*  Ten (10) marbles are removed from the box, which now weighs 290 grams.

*  How much does the empty cardboard box weigh?

 

NOTE:  Thanks to the 2019 edition of:  The Mensa Puzzle Calendar.

 

[Bravus]

I get 110 g, doing it roughly in my head.

[JoeMo]

14 hours ago, Bravus said:

I get 110 g, doing it roughly in my head.

I agree: 110 g (doing it in my head).

[Gregory Matthews]

*  The removal of the 10 marbles showed a loss of  60 grams.  Therefore, each marble weighed 6 grams.

*  On this basis, the 40 marbles weighed 240 grams.

*  This gives the empty box a weight of 110 grams.

 

[JoeMo]

10 hours ago, Gregory Matthews said:

*  The removal of the 10 marbles showed a loss of  60 grams.  Therefore, each marble weighed 6 grams.

*  On this basis, the 40 marbles weighed 240 grams.

*  This gives the empty box a weight of 110 grams.

 

Then we all agree.  I love it when that happens.  I wish it was that easy for people to decide which day was Sabbath in Fiji and Samoa.

[Gregory Matthews]

I am not certain that we all have to agree on every aspect of Biblical doctrine.

Disagreements can push us into in-depth study, which is good.

In truth, there a doctrinal positions that are not salvific--our salvation does not depend upon our understanding of that doctrine.