Of three babies born yesterday, the lightest weighs five-sevenths as much.........how much does the heaviest baby weigh?

Question

Of three babies born yesterday, the lightest weighs five-sevenths as much as the heaviest, which is as much heavier than the middle-heaviest baby as the middle baby is heavier than the lightest.
If the middle baby weighs 91 b, how much does the heaviest baby weigh?

Answer 1

106 1/6 b

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L=Hx5/7
M=91 b
H-M=M-L
H+L=2M=2x91=182 b
H+Hx5/7=182
H=106 1/6 b