Question

Nathan and Steven stacked boxes on a shelf. Nathan lifted 13 boxes and Steven lifted 15 boxes. The boxes that Nathan lifted each weighed 12 lb more than the boxes Steven lifted.

Which expression represents the total number of pounds Nathan lifted?

Let s represent the weight of the boxes that Steven lifted.
A.13(s +12)
B.s + 12
C.15(s + 12)
D.12(s + 13)

Answer 1

Okay this is good stuff. So every box that Steven lifted was TWELVE pounds LESS than Nathan's. So if s represents the weight of the boxes that Steven lifted, the expression for JUST THAT would be s + 12 = n. 'n' stands for the weight of the boxes that Nathan lifted.

Answer 2

Following so far?

Answer 3

yes

Answer 4

Okay cool. Now, Nathan lifted 13 boxes altogether. So, we want to multiply 13 by whatever is s + 12. Which expression matches that?

The '15' boxes that Steven lifted isn't information that we need to know, keep that in mind.

Answer 5

ok

Answer 6

thank you so much

Answer 7

No problem! Which answer do you think it is?

Answer 8

B

Answer 9

wait C

Answer 10

That isn't correct. B is the amount of pounds that Nathan lifted for just one box. We want to know how many pounds he lifted for ALL the boxes. For example:

Steven lifts a box that is 8 pounds. 8 + 12 = 20, so that means Nathan lifted a 20 pound box.

However, that isn't what the question asks for. We want to know how many pounds he lifted for ALL THIRTEEN boxes that Nathan lifted.

Remember, 15 is how many boxes STEVEN lifted, not Nathan.

Answer 11

im sorry its A

Answer 12

Maybe I'm not explaining it correctly.

Here's what we know:
Steven lifted 15 boxes.
Nathan lifted 13 boxes.
Every box that Nathan lifted, was 12 pounds heavier than every box that Steven lifted.

Here's what we need to figure out:
What expression would give us the answer to how many pounds Nathan lifted altogether?

The expression: (s + 12) is how many pounds Nathan lifted for one box. It's the weight of the box Steven picked up, plus another 12 pounds. This would not be the correct expression.

The expression: 15(s + 12) is how many pounds Nathan lifted, if he had picked up 15 boxes. However, Nathan did NOT pick up 15 boxes. STEVEN picked up 15 boxes. This would not be the correct expression.

Answer 13

That's right! Read my explanation anyway just to make sure you have it, but A is the correct answer. The expression tells us how many pounds Nathan lifted altogether for the 13 boxes that he picked up.

Answer 14

thank u