Word problem

[Mathlete21]

Bryan has always been fond of studying rocks and minerals. He has a room full of samples of different types of rocks.
One particular day, he went into the room to take a look at his mineral samples. If he has 65 samples of minerals per shelf, and he has a total of 7 shelves, how many mineral samples does he have?
2. He then classified some of the rocks into igneous, metamorphic and sedimentary. It took him 4 hours to soft them all out. If each classification has 246 samples each, how many rocks does he have in all?
3. Bryan took a look at his books as well. He has a bookshelf al

2. He then classified some of the rocks into igneous, metamorphic and sedimentary. It took him 4 hours to soft them all out. If each classification has 246 samples each, how many rocks does he have in all?

How is the answer: 738?

 

[lev888]

Please clarify which question you are answering and post your work.

 

[Mathlete21]

The one about rocks

 

[Dr.Peterson]

2. He then classified some of the rocks into igneous, metamorphic and sedimentary. It took him 4 hours to soft them all out. If each classification has 246 samples each, how many rocks does he have in all?

How is the answer: 738?

There are 3 types of rock, and he has 246 samples of each. What is the total?

You didn't tell us why you question this; perhaps you somehow used the number 4 in your calculation? It is irrelevant.

 

[Mathlete21]

Photo

 

[JeffM]

This is a problem in reading comprehension.

You seem to be confusing the mineral samples with rocks. There would be an inconsistency in that case.

I cannot say I like the wording of the problem. Third graders are still learning to read.

 

[Steven G]

3 types of rocks, 246 for each type.

246 for igneous
246 for metamorphic
246 for sedimentary
Total= 246 + 246 + 246 = 738

 

[HallsofIvy]

Bryan has always been fond of studying rocks and minerals. He has a room full of samples of different types of rocks.
One particular day, he went into the room to take a look at his mineral samples. If he has 65 samples of minerals per shelf, and he has a total of 7 shelves, how many mineral samples does he have?

That is simply 7(65)= 455.

2. He then classified some of the rocks into igneous, metamorphic and sedimentary. It took him 4 hours to soft them all out. If each classification has 246 samples each, how many rocks does he have in all?

"Igneous, metamorphic and sedimentary" is 3 classifications. There are 3(246)= 738 rocks.

3. Bryan took a look at his books as well. He has a bookshelf al

2. He then classified some of the rocks into igneous, metamorphic and sedimentary. It took him 4 hours to soft them all out. If each classification has 246 samples each, how many rocks does he have in all?

How is the answer: 738?

For (2), yes.

 

[Dr.Peterson]

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It would be very helpful if you would tell us your thinking, not just the problem. Why do you think the answer is wrong? What did you do to get the answer? There have been two suggestions as to what mistake you could be making; is either of them right?

The more you tell a helper, the better the answer you can get.