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At present, 

Cally weight = C

Beth weight = 2C

Amy weight = 2B = 4C

 

one year back, 

Cally weight = C + 5

Beth weight  = 2C – 15

Amy weight  =  2C

2C + 2C – 15 + C + 5 = 115

5C -10 = 115

5C = 125

1C = 25

 

(a) Earlier Cally’s weight = c + 5 = 25 +5 = 30. Beth weight was 2C = 2 x 30 = 60Kg. 

(b) current weight 

 Amy = 100kg, Beth = 50Kg, Cally=25Kg. Average = 58Kg.

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