(10 + 3) * 2 < 30
10 * 2 + 3 * 2 < 30
20 + 6 < 30
26 < 30
 
(2 + 30) * 3 = 96
2 * 3 + 30 * 3 = 96
6 + 90 = 96
96 = 96
 
(1 + 20) * 4 > 80
1 * 4 + 20 * 4 > 80
4 + 80 > 80
84 > 80
 
(20 + 30) * 2 = 100
50 * 2 = 100
100 = 100