a = 3/2 + 5 b = -8/5 + 3
1) 2a + b = 2(3/2 + 5) -8/5 + 3
= 3 + 10 - 8/5 + 3
= 16 - 8/5
= 80/5 - 8/5
= 72/5
2) 5b - a = 5(-8/5 + 3) - (3/2 + 5)
= -8 + 15 -3/2 - 5
= 2 - 3/2
= 4/2 - 3/2
= 1/2
3) 3b / 2a
3b = 3(-8/5 + 3) = 3(-8/5 + 15/5) = 3(7/5) = 21/5
2a = 2(3/2 + 5) = 3 + 10 = 13
3b/2a = (21/5) / 13 = 21 / (5x13) = 21 / 65