A floor plan has a scale 2cm : 3 m. What is the actual length of a room measuring 30cm on the floor?

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I dont get it can someone help me bc i dont know how to solve it. Please help!!! Thank u

Mar 24th, 2015

Make a proportion 2 cm / 3 m = 30 cm / x m, where x is the actual length of a room.

x = 3*30 / 2 = 45 m

Mar 24th, 2015

Hey thnx for the hint but what do i do after the proportion?

Mar 24th, 2015

Solve it by cross-multiplication. For example,    2          6

                                                                          ----   =  -----

                                                                            4         x

gives 2 times x = 4 times 6, so 2x = 24. Then x = 12.

Mar 24th, 2015

Nevermind i got it thank u

Mar 24th, 2015

you are welcome


Mar 24th, 2015

Could u help me with another question?

Mar 24th, 2015

Yes, can you post it?

Mar 24th, 2015

Out of 240 marbels , 180 marbels are red . What percent of the marbels are red?

Mar 24th, 2015

180/240 = 3/4 = 0.75 or 75%

Mar 24th, 2015

Oh thnx ur really smart

Mar 24th, 2015

So if i ask u any question will u get it right

Mar 24th, 2015

What is the slope and y integer of the function?

Y=-1/2 (6-3x)

Mar 24th, 2015

y = -3 + (3/2)x by distributive law

the slope = 3/2, the y-intercept is - 3

Mar 24th, 2015

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