Monday

September 1, 2014

September 1, 2014

Posted by **INDIANA** on Wednesday, July 4, 2012 at 3:49pm.

the length of the first piece is x cm

the second piece is 3cm shorter than the 1st piece

the third piece is twice as long as first piece

(a) state in terms of x the length of the pieces (i think i figured that one out...1st piece= 21cm-xcm, 2nd piece= xcm-3cm and the 3rd piece= xcm X 2cm i dont know if its right)

(b) write an expression in terms of x to represent the sum of the lengths of 3 pieces.

- Mathematics -
**Ms. Sue**, Wednesday, July 4, 2012 at 3:59pmYou're on the right track.

I'd state it this way.

x + x - 3 + 3x = 21

5x = 24

x = 24/5 = 4.8 cm

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

4.8 + 1.8 + 14.4 = 21

- Mathematics -
**Steve**, Wednesday, July 4, 2012 at 6:12pmHmmm. I'd have said (since the 3rd piece is

**twice**as long as the first):

x + x-3 + 2x = 21

4x = 24

x = 6

- Mathematics - Thanks, Steve -
**Ms. Sue**, Wednesday, July 4, 2012 at 6:13pmOoops -- thanks, Steve for the correction!

- Mathematics -
**Nataliya D.**, Sunday, November 17, 2013 at 5:16pmHi there, you both, did not answer on the part (b)write an expression in terms of x to represent the sum of the lengths of 3 pieces.

x + (x - 3) + 2x

**Answer this Question**

**Related Questions**

math - a drinking straw of length 21 cm is cut into 3 pieces. the first length ...

Maths - A drinking straw of length 21cm is cut into 3 pieces the length of the ...

math - A cable 40 feet long is cut into three pieces so the length of the second...

math - a 27 inch board is to be cut into three pieces so that the second piece ...

math - a wire 54cm long is cut into three pieces. the second piece is twice the ...

Algebra - A board 5 feet long is cut into two pieces such that the length of one...

math - Keisha had two pieces of ribbon of equal length. She cut the first piece...

Algebra - A rope 116 inches is cut into three pieces.The middle-sized piece is ...

math - a 32in board is to be cut into 3 peices so that the second board is twice...

mathematics 1 - A piece of wire 27/32 inch in length is cut into 3 equal pieces...