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A scale drawing has a scale of 3 in: 10 ft. Find the length on the drawing for each actual length.

 

 

 

* 40 ft.              *  3.5 ft                                                      * 6. 6 ft

 Mar 17, 2021
 #1
avatar+201 
+2

40ft/10ft=4

 

4*3=12

 

3.5 ft/10=0.35

 

0.35*3=1.05

 

6.6ft/10=0.66

 

0.66*3=1.98

 Mar 17, 2021
 #2
avatar+118015 
+2

Note  something  that makes  this easier

 

10ft = 10 * 12 in =  120   in

 

So

 

3 in  /10 ft  =  

 

3 in / 120 in  =    1   / 40    means  that the length on the drawing  is  1 / 40  th   that of  the  actual length

 

So...now it should be easy

 

40 ft ( 1/40) = 1 ft  on the  drawing

 

3.5 ft ( 1/40) =  3.5 /40   = .0875 ft   on the drawing

 

6.6 (1/40)  =  .165 ft on the  drawing

 

 

cool cool cool

 Mar 17, 2021
 #3
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Why u divided by 40??

Guest Mar 17, 2021
 #4
avatar+201 
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oops I made a mistake

 

Thanks for posting CPhill :D

 

and he divided by 40 because our conversion factor of feet to inches is 1:12, so we have 10*12=120, 3/120=1/40, so we divide by 40

jxc516  Mar 17, 2021
 #5
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A scale drawing has a scale of 3 in 10 ft. Find the length on the drawing for each actual length.

* 40 ft. = 480 inches                  *  3.5 ft = 42 inches                   * 6. 6 ft = 79.2 inches

 

120 / 3 = 480 / x

 

x = 480 / 40         x = 12      

 

 y = 42 / 40          y = 1.05

 

z = 79.2 / 40       z = 1.98

 Mar 18, 2021

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