Catelyn B.

asked • 03/13/18

The lengths of the four lines are x cm (x-3)cm, (0.5x + 15) cm and 2x the total length of the four lines is 66cm. Work out the length of the longest line.

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Andrew M. answered • 03/13/18

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The lengths add to 66 cm
 
x + (x-3) + (0.5x+15) + 2x = 66
 
4.5x + 12 = 66
4.5x = 54
x = 12cm
 
Knowing that x=12 what are the lengths?
 
x = 
x-3 =
0.5x+15 =
2x = 
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Catelyn B.

Yea but whats the answer 
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03/13/18

Andrew M.

Plug 12 in for x.
Your lengths are:
 
x = 12 cm
x - 3 = 12 - 3 = 9 cm
0.5x + 15 = 0.5(12) + 15 = 6 + 15 = 21 cm
2x = 2(12) = 24 cm
 
Longest side is 24 cm
 
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03/14/18

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