Three friends

Danica, Lenka and Dalibor have altogether 96 kg. Lenka weighs 75% more than Dalibor and Danica weighs 6 kg more than Dalibor. Determine the weight of Danice, Lenka and Dalibor.

Correct result:

a =  30
b =  42
c =  24

Solution:

a+b+c=96
b = 1.75c
a = 6+c

a+b+c=96
b = 1.75•c
a = 6+c

a+b+c = 96
b-1.75c = 0
a-c = 6

a = 30
b = 42
c = 24

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