Parallelogram

Side a of parallelogram is twice longer than side b. Its circumference is 78 dm. Calculate the length of the sides of a parallelogram.

Correct result:

a =  26 dm
b =  13 dm

Solution:

a=2b
2(a+b)=78

a=2•b
2•(a+b)=78

a-2b = 0
2a+2b = 78

a = 26
b = 13

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