First wach wroked out that 105 divide by 7 was 15 most of us drew 7 circles we counted in 10s 7 time and then in 5s and that made 105 which left 15 in each group
The next step is to take the number 15 and time it by the numerator which was 4 15 x4 =60
60 mussels could be taken by the fisherman 4/7 of 105 is 60 mussels