Multiples help?

Question

Sally, Fred and Peta went fishing

Sally caught a fish 2/3 of a kg
Fred caught a fish 3/5 of a kg
Peta caught a fish 4/7 of a kg

Thanks 4 da help

Answer 1

put at the same denominator 3*5*7 =105

fish of sally 2/3= 2*5*7/105 =70/105
fish of fred 3/5 =3*3*7/105=63/105
fish of Peta 4/7= 4*3*5/105 = 60/105

total weight = (70+63+60)= 193/105 = 61/35 kg

Answer 2

let x = total weight of fish in kg

x = 2/3 + 3/5 + 4/7
x = 70/105 + 63/105 + 60/105
x = (70 + 63 + 60) / 105
x = 193/105
x = 61/35 kg

Answer 3

=2/3*3/5*4/7
=(2*3*5)/(3*5*7)
=10/35
=2/7kg