## rachel/411 2 years ago Joe's dad had a box 2 ft long, 1 ft high, and 1 ft wide in which to pack items from the garage. After packing a few items, Joe found the box was not big enough. He suggested they use another box that was tewce as long, twice as high,and twice as wide. He said the box would have twice the volume as the first box. Was he right? Explain.

1. rachel/411

@timo86m

2. hartnn

what do u think ? was he right ? whats the formula of volume of box ?

3. rachel/411

lwh?

4. hartnn

yes,V=lwh now twice as long-->2l, twice as high--->2h and twice as wide --->2w so what is the new volume ?

5. hartnn

is it 2V ?

6. rachel/411

um it is not twice the volume of the first box.

7. hartnn

thats correct, its not twice. So, how many times is the new volume ?

8. rachel/411

um, 4?

9. rachel/411

how come?

10. hartnn

new V = (2l)(2w)(2h) =... ?

11. rachel/411

2*2*4?

12. rachel/411

16?

13. hartnn

new V = (2l)(2w)(2h) =2*2*2 lwh = ...?

14. rachel/411

8.

15. rachel/411

so, wht should i write?

16. hartnn

yes. new volume is 8 times the old.

17. rachel/411

okay. but he is not correct. so,no,because the new box has a volume of 8 times more than the old one?

18. rachel/411

would that be a good statement?

19. hartnn

yes, the statement is correct.

20. rachel/411

thank you,sir*shakes hands with hartnn*

21. hartnn

welcome ^_^