помогите , срочно!!!!!!!!

1)
1) 1 5/9 : 7/24 = 14/9×24/7=48/9=5 1/3
2) 7 - 5 1/3 = 1 2/3
3) 1 2/3 × 1 7/20 = 5/3 × 27/20 = 9/4 = 2,25

2) а)
6:5=х:75
5х=6×75
5х=450
х=90
б)
5-у/4=3/7
35-7y=12
7y=23
y=3 2/7