Verified answer

1

7 : 8 = x : 96

x = 96 * 7 / 8 = 12 * 7 = 84

2

y : 1 5/31 = 7 3/4 : 1/3

y : 36/31 = 31/4 * 1/3

y = 31/12 * 36/31 = 3

3

a/0.6 = 25/3

a = 25 * 0.6/3 = 25 * 0.2 = 5

4

(2+t)/5 = 4/9

2 + t = 20/9

t = 20/9 - 2 = 20/9 - 18/9 = 2/9